Given that we have Battle Sprites consuming all of our minerals now, it makes sense that Gate Construction has disappeared. But with Grey Havens behind the wheel now after years of stagnation, it seems like now is the time to start working toward fixing it, because it's always been a core part of the game's lore, and just has a lot of potential to make the Arcade more fun.
The model I'm thinking of will let Battle Sprites and Gate Construction coexist without the Arcade becoming total chaos like it was when Battle Sprites first came out and the feature wasn't removed yet.