The replacement*s* would not arise until after the original died; if that was a sudden and final thing then they'd pop up quickly and try to transplant the comm

The replacement*s* would not arise until after the original died; if that was a sudden and final thing then they'd pop up quickly and try to transplant the community as a first focus. If it changes more subtly then there's a long process of new communities growing and nothing quite like the original ever happens again.