I have never heard such a load of bol**ks for a while. This is not the school playground you know, these are two businesses. I dont expect Flybe give a monkeys about Aer Arran to LCY as many have pointed out it was expected. Flybe will still have a lot of people using their LGW for connections.
They will not 'have a tantrum' but may adjust their schedules in accordance with supply and demand - something which only professional carriers do to remain profitable.