I don't expect WP7 to immediately take the market by storm. If anything, Microsoft showed what they do with the Zune; they don't care for market dominance, just a share of that market will do them just fine. WP7 won't be the dominant phone, but I can see it being the new Blackberry and finding a great niche of paying customers.
> Android has shipped a lot of handsets, but the users don't seem to like to pay for apps.
This is the attitude I cannot understand. People won't pay money for things that don't provide value, regardless of platform. Choosing Apple because "iPhone users pay for stuff" is like opening a McDonalds by a public school because "they've got the money to buy things". The Android market isn't perfect, but it's getting better and better and people that make good apps for Android will likely be rewarded by great sales.