I'm sure this petition had more credence if it was people posting on Battle.net.
As far as I remember, isn't Battle.net restricted to purchasers of Blizzard products? Anyway, if it is indeed only to those who have purchased Blizzard products, then they have a much larger say to Blizzard to convince them of a Linux port (or a Linux installer). Then again, this may not work too knowing companies largely ignore Linux.
On the flip side, seeing that Starcraft 2 is already running and it seems like it's going to be a PC only game, the ease of porting will most likely depend on how they designed their game from the ground up.
EDIT:
Noting that Starcraft 2 is heading to PC and Mac, that increases the chances technically speaking on Starcraft 2. It doesn't guarantee a Linux port though.


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