I'd never been to the Disney Gallery when it was above PotC but I did enjoy it when it was in the Town Square. I only visited when there was a new exhibit, though, so I'm okay with it downsizing.
I agree with the previous posters who mentioned the Blue Sky Cellar being merged with the Gallery. Give Disneyana a bigger space where it is now, which gives Disneyland the big retail space it loves, and curate a great exhibit in the Cellar. Make the lobby of the theatre nicer, or return it to how it was a few months ago.