I’d say the most likely thing is once castrum is old content they’ll nerf it. I could see the minimum being lowered to 8 people and doable by a full party.

Another possibility. Next patch BLU is going to be 70.... if they allow BLUs into eureka, then they’ll likely allow them into bozja. Then when the next expansion launches and BLU gets bumped up to 80, let’s say there’s a spell in castrum....