In fact, I bet that it will drop their core share to something half of what it is today in just 1 year - that's called speculation, not fact. Mainly because Zune Marketplace isn't even in most of those places, so that means content isn't there. Now that ecosystem is starting to lack some bite - Microsoft's that is. They're finally testing in Australia now for WP7.
Bada has more exposure to more countries than WP7. And I'd call Bada a niche player.
I have a WP7 phone. Right now. Let me tell you this... it ain't ready for primetime. I've also played with build 7661 of Mango. Allow me to say that it brings some nice things to the table; still not ready for primetime.