This Mixed Reality platform Microsoft is creating is waaay bigger then gaming. They are basically adapting their line of thought that made Windows the biggest OS system to this Mixed Reality platform.
They have multiple headsets, multiple hardware compatible, focus on creating tools that are appealing to the mass market and a big push because they already have this huge userbase with Windows 10
I think VR is slow at the moment because most focused on gaming first, while the focus should have been something with more broad public appeal, and then the gaming elements would come in naturally. Thats why I think MS (which is showing this is somewhat their approach) has a great chance to lead this Mixed Reality market and make it a popular platform.