I don't think vendors will do this for a while. After getting a lot of flak for railing against this (replacing the gplv2 linux kernel with a proprietary closed source one, essentially), I did some reading... it seems as if it's so buggy all kinds of basic software doesn't even work. On top of all the idealogical reasons to not use this, pragmatically MS has a very long way to go before the WSL is any kind of real threat to GNU+linux.
Emphasis on GNU.
This is usually where someone naively says "but GNU tools aren't that good and aren't used these days" (which is utter bs)
If you take the GNU and the linux out of GNU+linux and put it top of windows, what do you have left? Basically just windows. To hell with that. Windows is malware.