Activision just lost 6 million WoW subscribers in China, if they stop supporting Sony they just die...
That, or Kotick the funny bluffer is just fired. I guess Sony boss got on his nerves for some reason.
I find this whole story strange, playstation brand (PS2/PS3/PSP) is a major part of Activision business and revenue, there are lots of Sony songs they would loose in Guitar Hero, there also Sony movie licenses in some of their games, they couldn't release those games either... That just doesn't make sense.
On the other hand, PS3-only users wouldn't loose much, only Guitar Hero (bested by Rockband long ago) and Call of Duty (playable on PC and bested online by Killzone 2 in my opinion). But nothing will happen.
I think Wii will still get a lot of support from them.