I don't think they need Android. What matters is the Android apps. As I understand it, those are supported by a modified Java virtual machine. That VM could be ported to Meamo, without porting the rest of Android. And further, both Meamo and Android's VM are sufficiently open source that any competent developer could do it. It doesn't have to be Nokia, and they might not be able to prevent it.
So I wouldn't be surprised to see Android Java-ish apps running on an N900 before the end of the year. And I suspect that would be a good thing for all concerned. It'd help Nokia sell the devices, it'd give users access to more phone apps, it'd give Android developers access to Nokia's phones, and it wouldn't compromise Nokia's vision or Google's.