You're right.. I think the N900 hopefully marks an end of "here is a platform designed for one device" and the introduction of "here is a platform for many devices" Maemo 5 is designed for the N900 where as Android is designed for numerous devices and platforms (hence why it'll run on the N900) For Nokia to keep up with the rest of MeeGo, they'll need to adopt that approach.. It's what user's are definitely starting to expect in a big way..
They're maemo and MeeGo... "Meamo!" sounds like what Zorro would say to catherine zeta jones... after she slaps him for looking at her dirtily...