They really have trouble selling E and D as most people recognize that there is no sense in paying that extra when the G and F cabins are exactly the same. As long as the benefits offered do not detract from the ambiance on the ship "that you step in the hall and all is equal" I think all will be well. The larger suites have extra benefits now and have for years that has not detracted from the ambiance of the ship in any way.
Marc on the upgrade issues if that is offered in the "concierge" cabins it is my guess that the "paid upgrade" program will continue. It has been very successful and I see no reason for them to stop that program. With that program in place there will seldom be an available suite to be upgraded to anyway. When those paid upgrades are offered they sell like hot cakes and often go within hours so it may be "much ado about nothing".