Especially once (if?) Pandora does come through; at that point, there's already one open Maemo-capable machine, which will nearly saturate the market, but the hurdles for anyone else to launch a new one would be the same.

OTOH, the Pandora guys might be in a position to release the same thing in a different form-factor; IMHO it could be based on the same circuit-board, screen, etc., just a different case mainly (and less components). Unfortunately, as a gaming-centric operation, they're not likely to pursue that option...