That's a valid concern about people's armies no longer being usable, and I'll have to figure out some way to make it obvious why their army isn't legal. The change itself was met with approval from the people who commented in the community, so I think that it will be well-received in general.

That is why I made it a common, though. It should be fairly easy to 'reactivate' their army for people who couldn't use their favorite setup anymore.