As an administration there are lots of things we want to work on.
Lockers we could conceptually look in to. I don't think we want to move away from the guild drop room as the primarily location for storing gear. But there are occasions - in particular since the introduction of imbuements - where players invest a lot of time and money into items and should have an opportunity to have them safely stored away.
I can see the possibility of the gnomes of Genesis offering their services for safe storage of items - at an extremely high price. Probably charged by the hour, debited from your bank account.. and if your funds run out they are entitled to recoup costs by putting said items on the AH

. So you definitely wouldn't use this service for ever nice piece of equipment you got hold of... just the special ones.
That's how i'd conceptualise it. I don't know what other wizards feel about such a system... it really hasn't been discussed.
Then... you'd need someone to code it. Much like some of the great ideas around expanding the AH services, you need someone who knows their stuff to make it a reality.