Actually had a possibility of that happening at one point. The reason the Xbox exists is because Sony refused the offer Microsoft gave them to partner up and create a console. Basically Sony would have done all the hardware stuff and Microsoft would have made the OS and used their already established gaming resources to bring titles to the Playstation. The idea was that MS and Sony would work together to go up against Nintendo and Sega. However you can see how that panned out since Sony didn't want to work with an American company (due to the fact that they kind of resented the fact they couldn't out compete MS in the computer industry and had to use their OS). Also the Sega Dreamcast kinda died early on in the 6th gen.