If you think about the marginal cost to BA of providing the CCR as a separate lounge to GF, I assume it's not material. These are passengers that would otherwise be housed in the GF lounge anyway and it's not like the CCR has masses of staff swarming around while GF has none. I guess there's the additional cost of the premium drinks? What are the other material factors in the cost of the CCR compared to just making the space an enlarged GF lounge?
I also wonder about advertising revenue for the CCR. Anything will be particularly lucrative even compared to GF.
But otherwise it's not like it's something extra-special like its own terminal. Even the kitchen is shared with GF so the back-room production is the same.
With that in mind, and re my earlier comment - namely that the brand perception of BA and their First Class proposition overall is hugely important to them - I really can't see its demise coming any time soon.