Well, I don't know that the CLT hub could have sustained service to both London airports. It's expensive to operate and staff LGW for one flight which probably would have made both CLT-London flights unprofitable by splitting the passenger load into two flights.
Well, now the CLT crews can say goodbye to one of the better layover hotels, and the most convenient. Welcome to the Kensington Shoebox where the rooms are so tiny that you can flush the toilet with your foot, adjust the curtains, and answer the door without ever leaving the bed. Not to mention the excruciating ride to/from the airport.