Ah.... I say this..
Looking at the small picture, you are right. But, looking at the big picture, you are wrong.
Business has been and continues to be limited due to M$. Unfortunately history and timing support M$ business for the small picture, hence people like yourself who are seeing the small picture.
M$ or one OS does NOT offer the conduit for future and broader business.
Look what business Palm OS alone did!? Then, M$ CE did not even touch Palm Os until M$ was threatened and the M$ BS marketing engine was turned on.
Single OS offers like M$ are not at all healthy for the bigger business picture.
Sadly consumers and greed move the markets into short range conditions.
Luckly social evolution will clean out the M$ crap.
.. ;^)