The argument can also be made that he didn't do his part to get those 8-8 teams in the playoffs too. I don't think for a second those teams were 4-12 teams and turned into 8-8 all because of Romo.
Also, Romo doesn't have to carry the team alone. The teams help him get there but sometimes it takes a QB to go above and beyond to put his team in a position to win in those tight playoff games. I don't fault him for the GB game either, it was a team loss. WIth that said, he didn't do anything jaw dropping either. Look at Brady in the playoffs, he was a big reason his team advanced and he played a monster role in the super bowl as well throwing 4 tds. His RB's are playing crappy? No problem, he will just throw the ball 50 times and help to outscore the opponent and they can't do squat about it.
Romo is going to have to do something like this to be seen in the eyes of many as deserving of the hall. He has had one season where he played good in the playoffs and that was last year. The argument can be made that it takes having a top 2 offensive line and a top 2 running game in the entire NFL for Romo to go anywhere in the playoffs. I think there are plenty of QB's that could strive in that environment.
I have no problem ceding the point that Romo isnt Brady, P. Manning, Rogers or Brees. Which is why I dont expect Romo consistently chuck it 50 times and call him Brady-south. I dont think he is a prototype, anticipatory thrower like an Aikman, but more of a Farve who will not throw it away and wait for a route to develop a little more separation before throwing. That can be ok, but can be dangerous against teams with good pass rushes. I think Favre was highly overrated and cost huge games and numerous losses. Romo is more contained, but he still has to be saved from himself sometimes. On the flip side, a guy like Carson Palmer is textbook, but not necessarily flashy enough to improvise.
A manning or Brady team will likely always be at or > 10 wins (though they have played in some sorry overall divisions). But I dont see Romo is significantly worse then Wilson, Flacco and Eli (2) or even Ben (I think he is better than many). Which means he has as good a chance to win 3-4 game sin a row if he gets to the playoffs. Flacco and Eli are prime examples.
I dont know if it is worth going back into the 8-8 seasons, but that roster near what it is now. Costa, Berny, Livings, Ratliff, Coleman, Ball, Sensabaugh, McCray, Heath. B James and Newman were done, Hamstring Austin was never the same after 2009, etc. In addition, Garrett muffed a few games (i.e. this Wash game - moreso the AZ game, Lions/GB, etc).
All I know is Stephen MaGee, Jay Cutler, Sanchez, Tanneyhill, Stafford, Bradford, Freeman, Ponder, Gabbert, Vick/smith, Schaub, Locker, Alex Smith, werent going to get the 2011-2013 teams over the hump and I think they would have been worse even with an Eli, Falcco, and maybe Ben.
This team hasnt exactly been stockpiling backup talent at the QB spot