This has been discussed to death!

Where is your source of information that PR1.3 is the final update for maemo?

Since owning a Palm T3 (many years ago) I stopped trusting corporations to support their hardware.

The main reason I bought the n900 because it is mainly open source. When Nokia stop officially supporting it at least the community will continue updating it.
(and yes I know there are closed components!)

For example there's nothing stopping someone from creating an open-source equivalent to the media player.

The N900 has a healthy future with or without Nokia.