I think Adesk see their future as being bound to Micros**t's.
I suppose, also, that it makes sense to left the OS do as much work as possible. From that, it follows that SHX fonts will eventually be dropped completely. Bear in mind that SHX was designed to work with PEN plotters - when was the last time you saw one of them?
Personally, I still use RomanS but I anticipate that the time will come when that is no longer practical.