Microsoft: Games, games, games. MS's consoles are great but the games library SUCK SO INCREDIBLY OMG I JUST CANT BELIEVE IT. Exclusive games like Halo and Gears no longer draw the same audience they used to, and there's really no variety to look for in XOne.
Nintendo: "It would be awesome to have a console that can play all the Nintendo games plus the multiplatforms like Witcher, MGS, Dark Souls, etc". For me, that's just it. Get a console decent enough to support third party games. Besides that it becomes a matter of quality check for their own games because they can't allow stuff like SFZERO to continue. Also, make a big-scale 3D Pokemon game.
Sony: Buy Konami and give us Suikoden.
Besides all that, no charge for online multiplayer and get some seriously bigger virtual console gallery. It's incredible how they all suck.