As someone who disliked 3x enough to be for 4e when being for 4e wasn't cool, and who then found Wotc's "vision" of 4e unappetizing, especially as it was not backwards compatible, I'm pleased as punch that Paizo has pulled the sword from the stone.
People seem to forget or not to have noticed that the OGL is forever, that you can modify those rules, improve them and release a NEW version of The World's Most Popular Roleplaying Game. The OGL is a sword. Paizo will now wield it. And Paizo is NOT Fast Forward Games.
Paizo has a very loyal fan base to start and produces the highest quality of products, easily the equal in quality of Wotc. The open playtest will draw people into the Pathfinder RPG and refine the RPG. Paizo has a very solid shot of making this work.
Wotc has a name - D&D. 4e. Its based on the d20 system. So will be the Pathfinder RPG. So Wotc's "advantage" is the name - D&D. Systemically both 4e and Pathfinder will be d20 variants.
And Wotc goofed in the sense of setting this up for Paizo:
1) The jetisoned the backstory of D&D, leaving the name but not alot of the accumulated backstory behind that name;
2) The made 4e non-backwards compatible when they knew or should have known that gamers had a TON of 3x material they had invested in that would be invalidated;
3) The original OGL;
4) The cancellation of Dungeon and Dragon Magazine leaving Paizo with time on their hands; and
5) There utter failure to be able to deliver the GSL in any timely manner.
Paizo may be the next White Wolf level company to storm the RPG stage.