It feels to me that, with the kernel emulation in place, a third party can now step in to provide reasonable Android emulation on top of that. I mean, unless Android uses kernels with some custom syscalls, it should be usable, right? Now it's a question of recreating the userspace on top of that. I would imagine that many pieces would just fall in naturally, while others (most things to do with UI) would probably require rewriting to properly integrate with the Windows desktop... but it's still doable.