But Statman... tell us about the stats or RBs that had 370+ carries the previous season, and how they did the following.
		
		
	 
I'm impressed with the fact that you used 370 carries or more as the data pool rather than what most TV analysts have been doing. Many of them are far too proud of the C- they got in "Math for Journalism Majors". They typically use only those RB's that had a season in which they exceeded Murray's carries, 7 in total. There are numerous reasons for this information to be meaningless. 
You cannot compare production to a group in which that person is not included. All I have to do to invalidate any claim is to declare that Murray is not in the group of "RB's that have exceeded Murray's number of carries in a season".  You place the number you wish to test as the median, or middle value of the group.
Since the record number of carries of 416 is 24 runs more than Murray's 392, we can say that the highest number of carries is "within"  24 of 392. Since 368 carries is exactly 24 less than 392, it is most appropriate to say that 368 is also "within" 24 of 392. In fact, any RB with 368 or more carries are "within" 22 carries of 392.
I'm not in agreement that checking their numbers the following season is quite as fair. The real question with DeMarco Murray was whether he was going to be worth the value of his next contract, is this not so? Wouldn't it be more appropriate to measure the productivity of each player following their record carries by using the results of the next 3 years?
In any case, here are the results that you requested:
Player		Year	Age* Tm	Att	Yds	TD
Barry Foster	1992	24	PIT	390	1690	11
Christian Okoye	1989	28	KAN	370	1480	12
Curtis Martin*	1995	22	NWE	368	1487	14
Curtis Martin*	1998	25	NYJ	369	1287	8
Curtis Martin*	2004	31	NYJ	371	1697	12
DeMarco Murray	2014	26	DAL	392	1845	13
Earl Campbell*	1979	24	HOU	368	1697	19
Earl Campbell*	1980	25	HOU	373	1934	13
Eddie George	2000	27	TEN	403	1509	14
Edgerrin James	1999	21	IND	369	1553	13
Edgerrin James	2000	22	IND	387	1709	13
Emmitt Smith*	1992	23	DAL	373	1713	18
Emmitt Smith*	1994	25	DAL	368	1484	21
Emmitt Smith*	1995	26	DAL	377	1773	25
Eric Dickerson*	1983	23	RAM	390	1808	18
Eric Dickerson*	1984	24	RAM	379	2105	14
Eric Dickerson*	1986	26	RAM	404	1821	11
Eric Dickerson*	1988	28	IND	388	1659	14
George Rogers	1981	23	NOR	378	1674	13
Gerald Riggs	1985	25	ATL	397	1719	10
Jamal Anderson	1998	26	ATL	410	1846	14
Jamal Lewis	2003	24	BAL	387	2066	14
James Wilder	1984	26	TAM	407	1544	13
Jerome Bettis*	1997	25	PIT	375	1665	7
John Riggins*	1983	34	WAS	375	1347	24
LaDainian Toml	2002	23	SDG	372	1683	14
Larry Johnson	2006	27	KAN	416	1789	17
Marcus Allen*	1985	25	RAI	380	1759	11
Michael Turner	2008	26	ATL	376	1699	17
Ricky Williams	2002	25	MIA	383	1853	16
Ricky Williams	2003	26	MIA	392	1372	9
Shaun Alexan	2005	28	SEA	370	1880	27
Terrell Davis	1997	25	DEN	369	1750	15
Terrell Davis	1998	26	DEN	392	2008	21
Walter Payton*	1979	25	CHI	369	1610	14
Walter Payton*	1984	30	CHI	381	1684	11
You basically have a list of the greatest RB's in the history of the NFL.  
45.9% of these seasons were produced by eventual Hall of Famers.
54.0% of these seasons were produced by someone who did it more than once. It's difficult to say that a player has a high probability of declining when more than half of these seasons either get repeated or are already repeats.
The average age is 25.5. The average point in their career is 4.5 seasons. Interesting since they average a career span of 10.5 seasons, meaning the season occurred around the midpoint of their career. So much for the myth that a season such as this will destroy an RB's career.
The youngest RB was 21 (Edgerin James), the oldest 34 (John Riggins).
The average number of thousand yard seasons over the following 3 seasons is 1.5. The average number over their remaining career is 2.7.
 On the average, a RB that has had a season in which his carries are 368 or more will have almost 3 more years of thousand yard seasons.
26.1% had 3 consecutive thousand yards seasons immediately following.
47.8 has 2 thousand yard seasons in 3.
78.2% had at least 1.
This data by no means guarantees that DeMarco Murray would continue on his record breaking pace. However, it slams the door shut on any perception that DeMarco was in any way a high percentage risk. This, of course, is just one of many myths about DeMarco Murray. I suppose many of them were so quickly accepted as a means of justification for the actions of the Cowboy management.
Is DeMarco Murray an elite RB? I'll put it to you this way:
He starts the season out by breaking a 50 year old record of an historically elite RB like Jim Brown.  He ends the season by breaking the single season record of the guy who is the historical leader in NFL history, Emmitt Smith.
When you are breaking the records of some of the most elite RB's in history, doesn't that pretty much make you an elite RB?
Other items to ponder:
DeMarco Murray is the first Cowboy RB since Emmitt Smith at the turn of the century to record back to back thousand yard seasons. 
The Cowboys have recorded a thousand yard rusher 25 times in 55 seasons. DeMarco Murray is only the 4th RB in Cowboy history to record multiple thousand yard seasons.
DeMarco's 2013 thousand yard season was the 2nd highest in Cowboy history for average yards per carry of 5.17.  That was the season before our elite O-line given the most credit for this past season. Emmitt's 1993 Super Bowl season was ranked #1 at 5.25 yards per carry. You remember don't you? The year he sat out the first two games which the Cowboy's lost? 
The guy responsible for that decision was the same guy that is assuring you the running game will be better this year. You may want to adjust his credibility.
Last season DeMarco also broke the Cowboys single season mark for total yards from scrimmage which was 2261, that's 13 more yards than Emmitt Smith's 1995 Super Bowl season.
DeMarco Murray is ranked 3rd in Cowboy history for RB's first four seasons of rushing yards. The two top guys are in the Hall of Fame.
If you wish to debate my opinions that is certainly your right. However, 90% of what I have just posted are statistical facts unless I have made a mathematical error in my calculations. Feel free to check.