I bought a first generation Surfacebook a few years ago because I couldn't wait any longer for Apple to release their new MBP range, and I'm glad I didn't wait. It's the best laptop I've ever owned.
Even though I've moved away from .NET dev and work mostly with Ruby and Node it's still my favourite machine to use. I run Debian with minimal problems, and I'm started to get more into WSL, which seems to work brilliantly for all the use cases I've thrown at it.
If the numbers are strong on people moving from MBP to the Surfacebook, then it wouldn't be out of the realm of possibility for it to become a real option for developers, regardless of whether they want to use Windows or not.