I own a G1 (which runs Android) and would say that I do not believe android to be a niche market. Motorola has debateably staked their cell phone future on the android platform.
(
Motorola To Hire 300 Android Developers &&
Will Motorola Go All-In On Android? It Has No Other Choice. )
Now although I would love to see a "native" app for Android, the generic "Mobile" version and "Standard" version both appear to work through the browser and should function as a good stop gap.