If you like the guild stores and you think we should keep that system, this should work for you.
If you hate the guild store system and just want to be able to sell your important items in a functional AH, this should work for you.
Have an AH, but each player can only post 10 items on it at any one given time.
Anything above 10 items can still be sold on the guild store.
I think this would cut down on sell spamming in chat. People only tend to shout out the rare or expensive stuff, they can't seem to sell in a guild store very well.
All the simple stuff people were afraid the AH would be filled with millions of would not happen.
In the end we have a balance between a full blown AH and no AH.