I like the Shuffle a lot... I've got a 512mb version personally... I don't think I would see the value in a 2gb version, as I hardly see it in the current 1gb.
If they added support for multiple playlists (which I am hoping they do as a firmware update for all Shuffles) the 1gb would be pretty usefull, I might even buy one.
But at 2gb's I think it would be a but much for the Shuffles UI, or lack there of. Don't get me wrong, I think the UI works great now, for the 512mb with a single playlist. I can still find a particular song or artist on the 512mb if I just HAVE to hear something, but it holds enough to be interesting all day long.
What I would like to see is a small price drop in the current Shuffles, say $89 and $139 or so, add multiple playlist support (and fix audiobook bookmarking!), and then get rid of the 4gb HDD mini in favor of a 4gb flash based mini (could get to 4gbs with whatever the cheapest combo of flash chips at the time is... 2x2gb, 4x1gb, 8x512, whatever, as space isn't an issue with the mini). Use the same form factor and screen, and the same pricepoint of $200, but get 24+ hours of battery life and skip free operation.
I'd buy that in a second.