I'm not trying to defend the approach, but please think about it a little more.

Google's and Apple's (and most of the manufacturers') "new" OSs are just incremental updates. They usually don't have any breaking changes on the UI and the basic operation of their devices. Even if you look at Windows Mobile 6.1 -> 6.5 for HTC and Samsung, they just update the OS under the hood, their UIs (Sense and TouchWiz) remain exactly the same.

Now there are many users who buy a device such as the N900. However, only the minority of them even cares about updates or the OS (perhaps less than 10% of the buyers?), the rest are just using it like a regular phone or tablet, and these will never come to this forum.

Now imagine if MeeGo appears for the N900: the average user (who doesn't know what is a software update and why is it good anyway) just hits the "update" button and in a blink of an eye the entire UI and everything changes. S/he'll have to learn to use the device again, and s/he won't understand why. (Add to that the fact that even the user manual can't help them out.)

Although, even if not on an "official" update, I think we'll see an N900 section on meego.com's download site from which the users who care can download and install it. I'm sure of it.

The only announcement that remains: "It won't void your warranty." This way they would ensure that everyone who cares can upgrade and remain safe.

Anyways, I hope for the best. (And I'm going to buy an N900 soon. )