Yeah, it can be a problem. I'll use a comparison to another game with a similar setting (this one is specifically just the dorm though) - there are a similar number of LIs there and you can literaly pick all of them at the same time. It means that you might sometimes go a few updates before a scene with a particular girl, but there are always some other scenes/girls to keep you occupied along the way, and the story is fun enough to keep you engaged. If it goes the same way, this game will hopefully be fine. If it's always just the same girls getting some, and the same not getting some, it can easily become unbalanced.
Here, as with the other game, there are clearly some who will take a lot more work though, so you'll have the "easy" girls in the early chapters while working up to potentially getting the "hard" girls involved. I would suggest the staff, the lesbian couple, and Taylor look to be the main ones in the "hard" category. Probably Violet too, actually.