Dallas used to go through a lot of 3rd string QBs but Landry always seemed to find a #2 guy and stick with him until his current starter retired then the #2 guys were ready to step right into the starting role on day one. Merideth backed up LeBaron, Morton backed up Merideth, Staubach backed up Morton and White backed up Staubach; it wasn't until he got away from that formula in the mid 80s that our QB situation went down the tubes.
We haven't had a good developmental QB on our team since Danny White; Aikman was thrown into the fire as a rookie as has been every young QB we have brought in since Aikman retired until now with Romo and Henson. Personally I am glad to see Parcells sticking with these young developmental QBs behind the vets he is bringing in, one of them will turn into our next franchise QB when Bledsoe retires.
Go ahead and draft a new QB every year is you like but don’t give up on the developmental guys you have just because you have a new toy. That is what bothers me about this drafting a new QB every year you get into this flavor of the week QB crap if you are not careful.