So I work for a company which codes a white label mobile email Solution (down with BlackBerry) An whilst the company is still officially poking around with the SDK. I personally think this could be the next Nokia symbian level o/s. Note though that just because Google want it open doesnt mean by the time we get devices, the hardware companies won't have locked them down.
I've a £5 bet with a college Android is still a big thing this time next year. "Google first flop" he said. I think not..
Bigger than the iPhone me thinks.