Again for those of you wondering why GTA5 is not going to be released on Pc, PS4 or Xbone for the time being is that PS3 and Xbox360 will still be the number 1 gaming method in the world for publishers. The amount of PS4 and XboxOne sales can only be more than the current working PS3 or Xbox360 in 2-3 years. Even most people who put their PS3 or Xbox360 to the closet WILL bring them down just for GTA5. Even if GTA5 was available to all other platforms, it would still sell highest on PS3 or Xbox360 because simply there are millions of them out there.
It could be nice if GTA5 was also available for PS4 and Xbone at launch time, but that would only be beneficial to Sony and Microsoft selling more of the new consoles but that's it. Rockstar is doing an epic game with incredible details so it makes sense that for the time being it is only available for 2 most popular gaming platforms in the world. (excluding wii because its a different thing)
I am 100% sure that we will see GTA5 on PS4, Xbone and PC one day. Maybe a year later or so. And when that epic game comes for next gen consoles let's say next year, it will also help selling the new consoles more which will still make MS and Sony happy. I am pretty sure that many PS3 or Xbox360 owners would also go ahead and purchase a PS4 just to play that game in the near future. They may not do that right away as the PS4 and Xboxone game libraries will be very thin for the first year or so.
I think Rockstar is doing a smart move. Very smart.