I think it's inevitable that WoTC disappoints us (the old-school, hardcore gamers from way back) in their quest to greatly broaden the appeal of D&D. They are fighting for their survival in a world dominated by no-commitment-required games like WoW, and owned by a company that may or may not "get" roleplaying games. If they can pick up a million new players at the cost of 100K old players, they have to do that. They're a business, regardless of our personal attachments to their product, and they have to make money. From my perspective, they staff has done a fantastic job of balancing the business realities with their own love of the game. They've salvaged a lot more of the crunch and flavor of D&D than I would have guessed they could have.
The more of that opt out of 4E, the less influence we will have in the future of our game. That leads to a game that more quickly follows market trends and soon become unrecognizable. I won't opt out until I've given it a fair shake, because it matters to me whether the game survives or not. Sure, someone will come along and pick up the pieces if it self-destructs, but ask the Romans how that worked for them.