This is a very good question. With six classes, they had semifinal games running 3 1/2 hours apart starting at 9 am on Thursday, Friday, and Saturday ... where are they going to put two more games?
As for the finals, they could add another game on the Friday, maybe, and tighten up that schedule similar to the semifinals. If they did go with four championship games on one day, you're probably right, they'd go to a Friday/Saturday schedule, I'd guess. Another option would be just two games on Thursday and Friday with three on Saturday ... that's an extra day of Dome rental, though, so I don't know if they'll go that direction.
I really don't know how they're going to make the semifinals work, though.