Really, I don't see the problem some people are having. Sure, I'm pro-4E, but I fully accept that a percentage of current 3.5e players won't want to switch. This gives them an option, and Paizo the chance to keep making money. It's not like it's adding a split to the market that wasn't already coming anyway.
Personally, I want 4e. I've been playing (DMing mostly) 3e since day one and, honestly, I'm tired of it, which is why I won't be buying Pathfinder RPG. But I don't see a problem at all with anybody else who does prefer it, just like I see no problem with people who prefer HERO or GURPS. Or, for a more fitting example, I play Mutants and Masterminds, but have no problem with those who prefer Silver Age Sentinels, and I don't understand why anybody would.