I guess that all depends on what Parcells is thinking for the future; If Bled is his QB for the next couple of years in his eyes then neither of the other two are even in consideration and the only point would be to give them some valuable back-up playing time for back-up stints they may encounter in the near future. I just don't personally see either QB ever being a pivital part of our team aside from a back-up role, so i guess I don't see the point not starting Bledsoe.
Even if we were to not make the playoffs, think if Bledsoe won that last game against the rams on a rather high note? It very well could carry over into the next season. On the flip side, sit him and make him think he's done something wrong, and that also too could carry over to the next season. That's why teams seldomly ever give up once they're elimitated; seasons are continuous. Bledsoes season began in his first starting year in college and has yet to end.
And it's not as if the future of this team is sitting on the bench; we don't have a Rivers or Manning warming the pine; we have a would be could be Henson and some guy named Romo who could probably make a killing in the Pizza Delivery Business with a name like that.