In terms of positioning rankings in the NFL, my definition of "Elite" is "Top 5" at a position. Anything else is a slippery slope IMHO.
For NFL QBs, Manning, Brady, Rodgers, and Brees have been the Mt. Rushmore of NFL elite QBs for a while now. Brees is borderline this year, however, I don't think you get booted from the elite club until a full season of non-elite play has passed.
If you accept those 4, that leaves just 1 remaining spot for Luck, Rivers, Big Ben, and Romo to fight it out for. Is the Romo the best of that bunch? I'm not so sure.
It is tough to make a case against Rivers or Luck being that 5th guy.
So in summary, if you accept the definition of "Elite" being Top-5 at a position, then I don't think you can consider Romo elite.
JMO.