Agreed.
It does get a little hairy, because Romo is 30 and it's hard to say if the collarbone will be a problem in the future. From what I understand (and I'm no doctor), a collarbone is like a nose - if you break it once, it's not that hard to break again.
Still, like you say, it doesn't matter who we have taking snaps or running the ball if we can't block. And right now, we can't.
If Luck is there, which he won't be, but if he or one of the other high QB prospects (Locker, Mallet, etc), then I'd be all about trading the pick down, adding additional selections, and infusing youth along the lines and adding a potential stalwart in the secondary.
Either that, or stay put and take a can't miss blue chip OL/DL/Secondary/LB if they're sitting there on the board.