Love my N900. It has its quirks, but it gets a lot of things right that other handsets don't. Almost didn't go for it considering the let down of my previous N-series handsets but I'm glad I did. I don't have plans of upgrading my N900 any time soon, but if I did, I'd probably be looking for something similar in terms of features (upgraded of course), smaller in size (still need a hardware keyboard), same great stability (but there's always room for improvement), and with the UI kinks ironed out (hopefully).

Saying all this, I wouldn't be surprised if Nokia gave up the platform entirely because they seem to have a knack for making bad decisions (save the N900)...