Nintendo was suppossedly in talks with Hitachi, NEC & some other company about creating a hardware licensing scheme where electronics companies could make thier own system that played Nintendo games...this was a plan for "next generation", but I dunno if this is even a consideration now.
Sony wants to do hardware licensing, but unfourtunatly, they don't have enough of the market yet to create a "PlayStation consortium" forum...Microsoft is thier biggest obstical there.
MS originally wanted to make thier own like TV/PC's, but GateWay, Dell, HP & other PC makers had a problem with that. I mean, why package Window's OS's in with thier PC's, if MS was going to make PC's that would dirrectly compete and possible undermind them? So then after WebTV & Ultimate TV, MS went for console gaming as a "way in". They've recently started up a new Windows Media Center box for TV's too & with XNA MS has invested alot into bringing PC & TV's together and has alot of ways to make it happen.