If BA could hold up 5/6 daily LHR as well as a LCY service, that would be fantastic. Point to point traffic on LHR might drop, but the service could draw some passengers from ground transportation.
In an ideal world I think we would have British Airways to LHR and LCY as well as either Ryanair to Stansted or easyJet to Gatwick
Alas, consolidation is the name of the game! Keep what we've got and make money on it.