Yeah thats a fair point, queue times could definitely be affected if the playerbase is spread alot across too many game modes or team sizes. But maybe a compromise could be having limited time or rotating team size modes, like how cubecraft does with some seasonal or featured games?
That way, teams of 3 could still exist for skywars or bedwars without permanently damaging the queues. It would also help cube see if theres enough demand to support it more regularly I suppose.
It would be super useful for friend groups that dont fit into 2s or 4s.