They look pretty permanent to me. They've had no fewer than an average attendance of 17K fans (and no higher than 23K - when briefly in the Prem) for nearly 15 years.
We were 10th in our first season of the Champ but couldn't meet demand.
We were 20th in our fourth season in the Champ but still attendances / ST holders held up.
We now have a long waiting list for STickets and all our home games sell out.
This might happen and clearly 30K crowds for a...