MeeGo is a fully community-controlled mobile operating system. Unlike Android, both development and the future course is determined not by a single entity (with influence behind the scenes) but by everyone involved, and most importantly, in public. Admittedly MeeGo has had to transition into this from its start, but instead of having to wait for Google to drop the latest version of Android you can follow it in-progress (for better or worse.)

It's much more "forward looking" and has a lot more in common with regular Linux distributions than stuff like Android. This lets it leverage existing software projects and frameworks, with the goal of it being easier to maintain and advance than doing it all yourself.

Admittedly the value is very technical and somewhat esoteric, but it's those esoteric and technical reasons that I bought my N900 and why I'm hoping MeeGo is successful. It's not for everyone at this point, certainly.

Someone could make it, I suppose.

Unless there's something about Maemo right now that cripples it for you (IE you completely cannot use it) then you don't need to worry about MeeGo. However, down the line, you will probably be able to migrate your device (unofficially) to MeeGo if you really want to.