Re: What's next for Windows 10?
I guess they expect to work with the current user base to convince the other ones it's a worthy transition through their testimonies. The reluctance of the early adopters had to be broken somehow. Their continuous feedback made sure the next customers will get a polished OS. They'll upgrade probably together with a new machine.
So the low hanging fruit were harvested. The other ones will follow slowly but surely, while the next [very profitable] harvest awaits to be ripened: corporate customers. Those customers usually wait for a couple of years until an OS matures before plunging in. Their time will come soon. And that's where Microsoft gets its profit.
Don't worry. Microsoft knows how to make money.