I've been thinking about this on and off, while the 4e storm rages around me.
At first, I was thinking, "hmmmm ... I'll stop with 3.5, my collection of 3e stuff is pretty complete, and there's plenty of d20 stuff still out there."
Then, I thought "... but when 4e comes around, I'll take a look at it, and if I like it, I'll buy the core rules. But nothing more!"
Late at night, another thought snuck in. "Maybe ... maybe ... I'll buy the core books and any other books that look cool, just pick the cherries so to speak."
Now that I've read another thread about 4e I've come to a conclusion:
When 4e comes, I'll buy it. Just because I can.
So I'll be getting it, just because it's there, and I don't care if it sucks. I'll buy three sets. Just because I can.
/M