if flying with the squad is important to the squad, it shouldn't matter where they fly. Ask them to come to the other arena (which would help boost the numbers too).
LOL! Yeah ask YOUR squad all 10-20 persons to stop what they're doing and change to the smaller, dead arena because of one player can't get in. It will not happen and I wouldn't even ask such a thing from them.
I guess if the game effectively blocks squads from operating from now on, the message from the developers is to stop interacting as squads and go back to individual gameplay. Shame, I was a lone gun for years and now that I started to dig the squad thing, I'm blocked from the server.