Maybe you are right but what will happen if there will be released another phone with some more things the n900 doesn't have...and you won't get any updates, games, proper apps...etc. AND all the developers will forget that exists. As about sygic nav is not released because of nokia. Does anyoane have a clue why?
Oh so you already have inside information that Nokia has (in the past few days) dropped support for the N900 entirely? Or are you just trolling because you don't like the fact that the N900 has a cellular modem?
The moment the G1 (or any Android device for sale now) is dropped from sale you will see support dry up instantly. Even if you have a bug in a library that can't be upgraded without upgrading some driver, you will not get assistance.
That said, between how open Maemo is and with Mer moving forward, if a usable install for the N900 is ready before the next device is out I think a lot of complaints will be moot, and Nokia will show themselves willing to at least give the community enough support to keep their devices alive as long as possible.
Also, I don't think the days of a WiFi only internet tablet are coming back. WiFi is extremely restricting and had the N900 not come with GSM I'd probably be using an Android device now, disappointed in how limited the OS is and still thinking "if only..."