They cant sucker or force 650 million more machines to take their crappy spyware os?
No way. The uptake curve was pretty steep for quite a few months through end of 2015, but growth has leveled out and the projections are way short of a billion in another 2 years.
They'd have to completely disable all other versions of Windows (7, 8.x) -- as in make them stop working NOW -- to get the rest of the base over to 10.