Odhanan said:3.X through the OGL (and its huge number of variants and refinements for all tastes and styles) became such a phenomenon that I can hardly believe a huge proportion of gamers would just follow the move of 4E and give up on the OGL, particularly since it is not revocable and there still will be some people to publish stuff for it, at least during the years of transition.
HA! That's what people said when WotC bought out TSR and the 3e speculation began.
I expect after a year long promotion, people will be leaving in droves and 3e/3.5 will join the ranks of 1st/2nd edition players who cry out why their edition of the game is best to an uncaring, uninterested silent majority.
That is assuming 4x isn't a steaming pile of crap, which its almost guaranteed not to be.
Tom