But from their point of view, what's stupid about it? It will cost them money to make Meego work on the N900. It will not sell any new units. And I strongly suspect that this community will not want to pay for the upgrade.
For that matter, what pressure? "Dear Nokia, if you don't put Meego on the N900 I won't buy a new Nokia phone." But if they do put Meego on the N900 you won't buy a new Nokia phone either!
But besides that, if you're happy with the N900, why would you want to change to a new, unproven, OS mashup?