Keep sending "ideas" to Dutton-Vocalion. They are not going to reply to each individual correspondence (unless there's an issue with an order or there's a real question), because they honestly do not have time to send out a reply saying "Great choice, we'll check into it", or something like that, to everyone who writes in. However, I am sure they are taking note of all of the titles that fans suggest. If you send in Aerosmith or Pink Floyd, you are wasting your time. These high profile artists are very expensive to license and they are not the type of act D-V needs to release.
There are so many things that need to happen to get a title licensed and for every one that makes it out into the market I would bet there are 20 or 30 that either came "this close" or were at least planned but got torpedoed by a lawyer, and artist, a suit, a lost tape, or something stupid like they forgot the combination to the vault!
Right now pickings appear to be slim, hang in there and let time (and Michael) do their thing.