Why do they need a transition period? Non-MPEG-2 receivers will receive the exact same programming for the same amount of money. (Well, for the same price increase they would have had with or without the extra channels.)
I honestly don't understand why ANYONE is upset about this. Disappointed, yes, but being upset is absurd. Sure, we all love to get something for nothing right now, but it's not the normal way of life. Until upgrade plans are announced, there's no reason to be pissed.
BTW...this IS the start of the transitional period. Not having a transitional period means switching EVERYTHING to MPEG-4 today and leaving you with a blank screen.