It sucked that after gaming with one guy for nearly a decade, we were not gaming anymore because I wanted to try the new system (and was a bit discouraged with some of the old system elements) and he wanted to avoid the new system, so he moved to PathFinder to play a slightly better version of the 3.5 game that he had played for a long time (and for which a ton of his current books were compatible).
So you wanted to play a new game, and he didn't. And somehow that's WotC's fault? You got bored with 3.5 and because WotC had the audacity to offer you something new to play and you took it... you get to blame them that you and the guy don't play together? Sorry... but that's just not accepting personal responsibility.
You chose to abandon your friend and his Pathfinder game. No one forced you into it. You have no one to blame for the two of you not playing together but yourselves.