I can't comment on when I think we'll ship or other numbers. I'm just saying those do play into our decisions.
I agree regarding static vs dynamic linking, just noting that people do some crazy things and sometimes it works.
It isn't always feasible to just use different APIs through LoadLibrary. Also, some APIs are not available under Metro (e.g. LoadLibrary itself is not available), so we would have to create multiple CRT binaries for different OS targets.