Rockstar are going to ignore it and release it on PC anyway. And not because of that other "bring GTA V to PC" petition that has 350K+ signatures. They would have been planning to bring it to PC since they started making it.
Releasing it on console first and not confirming or denying a game is coming to PC for a few months is a successful marketing strategy they have been doing since 2001. People just have very short memories, they can't even remember Rockstar did exactly the same thing in 2007-2008 for GTA IV. They did the same thing with the DLC for GTA IV as well. They released it on the 360, didn't confirm or deny it coming to PS3 and PC, then released it on both platforms regardless of how many people asked them not to bring it to those platforms.
Also if Rockstar did care about petitions, it will come to PC anyway.
341,362 vs 1,497