How you can suggest GB's growth is being restricted is beyond me. Time to command is 2-3 yrs tops, mainline its 8-10 min. Hardly anyone leaves GB so that must suggest expansion. Maybe if its all such a one way street you should suggest chucking in the franchise like Maersk/Duo did, they did really well on their own.
Theres space for both, BA will never fly to Hurghada/Tenerife but dont expect FRA and CDG to be given away.