I think there should be no limits whatsoever. But as you age, things get to be more of a hassle.
So, I think all of you who are too young to have seen a live game before helmets were made mandatory should stay away and wait your turn. Leave some room, space, and good seats for us old types.
You can start going to games again once we kick off/shuffle off this mortal coil, and the new limit is those of you left that are old enough to have seen games live with just one ref.
Seems fair. Everyone gets a turn. More space for everyone.