I agree that London could support more capacity, but who will provide it?
Aer Lingus and Ryanair have an interest in keeping yields high and will fight to keep others away.
Gatwick, in particular, could do with more capacity, but Ryanair's position there is defensive, trying to ensure that the route is unattractive to any carrier who may come in and dilute yields on their Stansted service.
In some ways, the least resistance would be on increases to Heathrow, where IAG could decide that more connecting traffic could compensate for a reduction in yield, but where is a slot going to come from in Heathrow? Cork is lucky to have the level of service it has at the moment.