As long we have community gods like Titan we should be safe. If it turns out that Meego don't have support for n900 i think it should be fairly easy to port it. Also the Meego are going to be supported on many devices armel and x86 so i am sure it will be alright... with that said...

I will probably stay with Maemo or equivalent like Moebian (which are being worked on right now). I am a Debian fanboy and plan to stay like that. One of the main reasons for that is that Debian got the best community support..