Nokia have serious business concerns related to the finite assets they have to maintain OS/app products across platforms.

If their new devices offer significantly different hardware, and usability features, then deciding to not officially support MeeGo (loathe the crappy name btw) on earlier devices is hardly unreasonable.

I'm not discouraged. Porting such things to alternate platforms has never been a problem for a determined open source community. If the most significant change is the capacitive/multitouch screen, I doubt it'll be too much of a problem - we can virtualize multitouch on the N900 and the underlying MeeGo OS will not know the difference.

Other hardware features...digital compass, perhaps...may simply have to be disabled and let those chips fall where they may, with respect to app behavior.

One way or another, if MeeGo is worth porting, it'll happen.