He's definitly way better than anything we have or could get via FA or Draft this year, but he's also a type of crutch, Jerruh and RHG expect him to bail the team out all the time, which leads to him pressing (p.s. not a good thing).
Trading him should give plenty of ammo for a rebuilding process, the problem is this team is good enough to get to or near .500 with Orton and the extra picks, and Romo would take his team to at least .500 too. That would leave us with a bunch of mediocre picks. If we want to really rebuild we have to tear everything out, trade Ware, Witten, Austin, anything and everything with any trade value over 29 maybe even 28.