At most that will just get it dismissed against some individual plaintiffs. It won't affect their case against the city and any companies such as the engineering firm that was a defendant in this particular lawsuit.
Which again, if they win, they pay for!
It'll come out of their taxes, which the city will either have to raise, or cut costs somewhere to pay for. The people responsible will be neither criminally nor civilly liable, leaving zero disincentive to others.