It's very common for towns of this size to have big restaurant turnover. When communities hit around 250k population they pop up on many chains' radars. There will continue to be a flushing/turnover for a while. To boot, the issue is exacerbated here by two things. Firstly, the seasonality as everyone knows. Secondly, bigger city rents with small city sales. It's clear any independent who opens needs to do thorough due diligence, design the business model for the demographics here, and realize that the sales per capita are weak. There's no expense accounts, yuppies or incessant tourism.
The kiss of death is for someone to visit on a gameday and think that's the standard. They need to come back in December or July and see the correction. It's clearly do-able to be in business here, but its more complex than most think.