If we don't like it (and I'm seriously assuming we will not) I'm hoping that the 3.5 community stays together and organizes. How much support do we really need to keep playing 3.5? We have all the crunch books we could want (and a few more than we wanted). There are tons of modules out there (and we can keep writing our own).
What we shouldn't do is give in and buy a bunch of 4th edition products if they aren't really great. If they want me to buy 4e books then they had better make the game so incredible that I actually want to go out and spend money on it. None of us should just buy it for the sake of buying it. If we don't like it, then we need to say so by not continuing to buy their products. We should also continue to enjoy the 3.x products that we paid for and have been having fun with all these years.
What we shouldn't do is give in and buy a bunch of 4th edition products if they aren't really great. If they want me to buy 4e books then they had better make the game so incredible that I actually want to go out and spend money on it. None of us should just buy it for the sake of buying it. If we don't like it, then we need to say so by not continuing to buy their products. We should also continue to enjoy the 3.x products that we paid for and have been having fun with all these years.