I'm not sure I see it quite the same way Mike.
All airfields are businesses, and to stay successful need to provide a service which the customers want at a price that's acceptable.
All flying schools need to be at an airfield.
If a flying school decides that airfield B meets its needs better than airfield A, then it's absolutely right that it moves.
Airfield A then can either improve service and value for money, or decide it doesn't want that customer. It's simple as that, and it's like this that services and prices improve in a free market.
G