Ok, let me see...
If it comes out just for PC, I will have to buy a new PC, that's like 900 dollars.
if it comes out on consoles that usually means Xbox 360 or PS3, so I will have to buy a new console, that's like 200-300 dollars, but then I would have to find on what console are my friends playing the game and hope that everyone is using the same one...
For me is a loss-loss situation, so either option is good I will still spend a big amount of money for that game.