Not really soon.
Arc ended up spoiling players by giving them a bossgirl every time on the earlier districts.
There’s a ton of districts, and that’s not counting the ones on the outskirts (and possibly even the mountains) map.
So not every single one will get a bossgirl from now on.
As a side effect, there’s a chance that the bossgirls we already get will have a bit more content than just the dungeon scene.