Yes BA has always placed emphasis on LGW although long hauls from here is now declining.
I am an enthusiast and love seeing various other carriers but i am looking at a it from a business perspective and not from one of nostalgia or anything like that.
If BA were to expand then the routes i'd see them doing would not really overlap much with other carriers and emphasis likely placed on North America. So LAX and SFO etc.
Finally, why not let GB take over some 'business' routes that cannot be flown by BACX or those which would be more profitable under a smaller organisation such as GB. I have stated before that several of BA's routes would be suited to GB as, while true its a mainly leisure airline, its route network centres on southern europe/med....so FCO and NCE (as examples of dropped BACX routes, would be prime for GB)