Once the games gets to the point where people can pay for it then the original design is enough imo.
But i think a lot of it depends what they intend to do around housing/storage/Market wards/AH an such so, guess we will have to see what they plan really.

Personally I would like to see a 3rd retainer added as a temp measure until we get player housing, then have 3rd retainer removed and the items placed into the house.
Though a limit on no more then 2 retainers at work in any one city needs adding along with that for now lol.