While I'm totally satisfied with the capabilities of the PS3 and 360, I'd buy a new console from Microsoft or Sony, too. Thing is, even now, after over half a decade, the PS3 and 360 STILL aren't profitable for lots of companies involved. Development costs still outweigh profits and often "sure things" end up as failures. Launching a console is always an expensive endeavor and even Nintendo is selling for a loss, now. I don't think it's good business launching a console now.
And I still don't think Sony will launch a PS4 until 2015. Quote me on this.