A sad equation. A ruinous outcome. First of all our mentality must change. It is completely ludicrous for you to think that someone from another town surfing your local wave is an intruder that must be driven away. What about when you want to travel.
Localism is small-mindedness.
You have to let people merge. You have to share your waves. But that's just maintenence. Not a solution. Something else must be done.