I hope they pull support, but I hardly think Actiblizz has the balls to do it. Atleast not completely.
They will probably still release CoD & GH on PS3, but not delay the 360 release to wait for its completion.
What I'd like to hear now is Sony's response to this news, and to see if they will cave to 3rd party pressures despite the need to have PS3 be profitable from a hardware perspective.
What I don't expect is for this to change much of anything towards the Wii. At best, maybe marginally more software support, but nothing too significant. Its not like all PS3 projects are gonna be re-routed to Wii, because as soon as last year 3rd parties have been saying "Games made for HD consoles just aren't possible on Wii", and I don't expect that mentality to change.