But will sales of Pathfinder mean some lost sales for 4e? Yes. That's competition.
Absoutely. WotC won't be getting my dime. I'm going Pathfinder. I haven't bought a Wizards book in over a year. In the mean time, I bought the remaining Dragonlance books from MWP and I've become a subscriber to the Pathfinder Adventure Path as well as the Chronicle. Let's see... About $20/month just for PAizo.....I think.