Goodness no. Even if I do find that I enjoy 4e as much as WoTC thinks I ought, I'll never be done with 3.x. After all, a ruleset is a framework. That's all it is. I can do anything I want in 3.x. It might be done easier using different rules, but I CAN do anything I want using it, and that's really all I want a ruleset to do. And as long as that ruleset allows me to run or play a fun game, then it's still got wheels and I will ride it. After all, 1st edition, 2nd edition, 3rd edition, whatever, they've all still have fun left in them. It's up to us to find that fun.