Well, why would you eliminate your most popular room or make it into an OV when OVs are cheaper than 7As? The only explanation I can come up with is that if people aren't reserving a 7A, they'll reserve a cat 4 or 5. But it's only 30 rooms. If they weren't so far aft, I'd agree that making them some type of concierge thing would make sense. But in that location? Probably not. The cat Vs are larger, so they aren't being turned into those, and with 3 decks, how would you put in a multi deck thing, especially without as much balcony as other parts of the ship?
What about HA rooms? Are there enough of those? Could it be they are going to rework the rooms to become HA rooms? That might be some heavy-duty work, though, as doorways would have to be widened. What about putting in single occupant rooms flanking an HA room? Of course, in both those cases, DCL would be losing rooms, not gaining them.
Maybe they're going to add connecting doors? But there's 5 rooms, not an even number. If it was this, they'd at least have one of the 5 that's untouched and therefore could be booked. Could it be a crew issue? Are they requiring more crew and need more crew space or maybe entertainers for a new show? But 30 rooms is a lot of entertainers or crew.