I'm not sure. I'll buy at least two copies -- one for me and one for a guy who wants to DM 4e and is moving back here in September, just to see if he likes it better.
For my games, I'm still doing 3.5e, and everyone is happy with it, with two actively anti-4e in the group I run. But I and a few others will read the Pathfinder rules and decide if we like it better. The closer to 3.5, the better for us, I think. I liked what I saw with a brief view of the beta, but I haven't decided on it yet.
If choose not to decide, you still have made a choice . . .