I'm not even sure if there will be an "X2".
To be honest I think it's just as likely that MS kills the idea of a dedicated home console if they lose big against Sony this gen.
What they will do is morph "XBox Live" into a game streaming/cloud based service. This actually makes much more sense within Microsoft's overall company strategy too (they are all about the cloud going forward). You won't need any hardware other than a controller.
I think in the next 5-6 years Nintendo will undergo massive shifts too. Their game hardware will become streamlined under one ecosystem primarily based around a tablet like handheld, which has games that can also be played on the TV (if you purchase their seperate "home variant" of course ... Nintendo still likes their console accessory sales). QoL will be a slow burner for them, what will surprise even Nintendo will be the popularity of amiibo, which will push Nintendo to become more of a toy manufacturer and get into new revenue streams like animated movies (the Pikmin shorts hint at this).
Sony will make a physical PS5, but will also start moving more and more into the digital streaming route like MS. Playstation 5 will be the last physical console they make because by PS6 it won't be neccessary anymore.







