Well they are all owned by Xbox so they should all be combined. Regardless of what people think of the fate of the plastic box, Xbox as a publishers and thus your already purchased games and saves are safer then ever.
Xbox is the worlds biggest gaming publisher that also happen to have their own hardware platform. I mean could you really navigate as a gamer today and NOT end up buying some games from MS? MS/Xbox games are about to be everywhere on everything, that certainly makes the eco system fairly future proof with many different lanes of revenue instead of relying solely on one plastic box
Pretty similar to Valve at this point and I think most people in the Steam/Valve eco systems are feeling pretty good about the future and so should Xbox fans.