Where are even the basic apps, IMDB, Facebook etc (not that this is school relevant, just saying). Developing apps started way before the platform was ever released...
My wife works for the government, certain sections develop apps (both for employees and public), platform? Apple... not even android... despite android being more popular than apple over here...
When is Metro even going to be considered...
There's a few things going on. For one, there isn't as big of a demand for apps like Facebook or IMDB because you have the full website available. An app would be nice, but you have complete access to the service already.
No way to answer when Metro will be considered. The Apple-first mentality is going to be hard to crack as you've seen - even when it doesn't match the user base.