You need to migrate to the single line field. Most of this I understand. It seems reasonable when explained to me. But stop and think about it for a minute. At most events, there are wide varieties of skill levels in both categories.
Collisions occur, lines cross, and hopefully everything gets straightened out with little damage.
The single line field gets filled with all kinds of kites, that are not as easy to control, and it is the kiters' responsibility to watch their kite and their neighbors. National Kite Month had several hundred events around the world that tried to bring kiting to a larger group of people. Experienced fliers flew next to newbies. I organized an event in my hometown that had enough room for all types of kites. We let the kiters find their piece of the sky.