Actually you Romo haters should be HOPING Romo comes back. If Romo stinks it up, you can say I told you so. I think Dak's emergence has Romo loomking over his shoulder, and even more importantly, management is also looking over his shoulder.
Tomo Romo is really behind the 8 ball in a way. If he were to go to the playoffs and stink it up, or whatever, it gives the Cowboys an excuse to move on and the Dak era would probably be underway, rightly, or wrongly.
The pressure to excel is on Romo. I am expecting to see him at his very best when he comes back. If I were Garrett, I would insist that Romo not come back until he is at 100 percent so there are no excuses for poor play of poor decisions which could cost us a game. That way if Romo succeeds as we all expect, then the coaches' confidence in him is justified. In the event he stinks it up, well, there would be very little room for justifications, because there is an alternative waiting in the wings.