I have just listened to the IAG results podcast question and answer session. A question was asked about Gatwick. Sean Doyle said they were reviewing Summer 2022 at Gatwick. They are in talks with stakeholders.
He also said they had to remain competitive in certain market segments, that he hinted would be even more price sensitive than pre-covid. I take this to mean the leisure and VFR marketS.
This could be hopeful news for Gatwick as it is a lower cost airport to operate from as well as being a more leisure orientated operation.
As I have said above, the Gatwick management is commercially pragmatic(perhaps more so than the management at LHR) and hopefully both airport and airline can see the advantages of a mutually beneficial deal.