The big question, in my eyes, is whether there’s actually significant demand for Office for Linux. On a good day, Linux has perhaps 1 or 2% of the desktop market. It’s important to remember that almost every Linux distro comes with LibreOffice for free. It’s only an educated guess, but I suspect there are scant few Linux users who would proactively go out and pay for Microsoft Office — after all, many desktop Linux users chose their operating system because it’s free (both in the money sense, and free from the real or perceived Microsoft hegemony).
Here we go. There is zero market for Office on Linux. Nada. The two userbases just don't overlap, both for practical and idealistic reasons. Hell, I'm on Windows and I've still used LibreOffice and OpenOffice for years.