Move to one platform. Overall cheaper
It is, but unfortunately, platforms still have exclusives so you could miss out on some good games and even with the consolization of games, at some point in the console lifecycle, the PC blows it away. And even discounting the PC's hardware advantage, you can't discount the PC's control advantage. A KB and mouse is just far superior to a gamepad in FPS games and good luck trying to play an MMO on a console without a KB.
In my case, I seriously considered making the PS3 my main platform before I built my new PC a couple of months ago. The problem is that most people I know have Xboxes rather than PS3s, and even though I have 2 Xboxes, there is no way in hell I'd ever make that my main platform. The ONLY reason I even buy games for the Xbox now is because they're games my brothers and I may play; otherwise, I've have gone PS3 exclusive 2 years ago. I also refuse to pay for XBL Gold to watch Netflix or play online. Yes, I'm pissed at MS (in addition to the reasons I stated, I've gone through4 or 5 Xboxes) and if I do get a console in the next gen, I am leaning towards the PS4 exclusively.