Am I the only one here with an average phone lifespan of 6 months. I can go up to a year, but after that time I usually want something new.

If this is your rate of consumption, then all fear is unfounded. It doesn't matter whether the N900 is upgradeable or not. If something nicer comes out, I'll just get that instead, even if I COULD upgrade my N900 to Meego.

Take a long hard look at your N900. What you see is what you will be stuck with for the foreseeable future. Don't expect free turn-by-turn navigation, don't expect Meego etc etc. I've had this device for about three months now. I might already be halfway through its lifetime, so I have to be in a frame of mind where what the N900 has RIGHT now is enough. Having said that, this device is so good (for me), that I might just end up using it for a whole year, but not a chance that I would go any longer than that and even then, I would already be 1/4th through its lifetime.