The Eagles were in a similar position earlier in the year when Michael Vick injured his hamstring. Kelly never ruled Vick out of a game, forcing opponents to prepare for Vick and Nick Foles. It wasn't until Vick was ready to return in Week 13 that Kelly finally chose Foles as the starter.
But there's a difference between preparing to play Vick or Foles, and Romo or Orton. Vick is arguably the best scrambling quarterback in league history,Bob Uecker Jersey, so defenses always have to be wary of his running.