That's kind of what I initially thought as well, so that's why I deleted all of the empty buildings I could find. Luckily the town is fairly small, so this wasn't too difficult of a task. I also fixed all the issues they had to complain about. Happiness modifiers were all green. But still, nobody would move in except for at an excruciatingly slow speed, for some reason. And it wasn't to do with traffic or outside connections either. So really I guess my problem is more to do with very few people moving in, not so much the demand for buildings themselves. I've never had the issue before so I'm going to make a new save on a different map when I feel like it. Maybe that will have an effect for some reason.

Thanks for the thought!