I'm sure someone's already said it, but there's no such thing as reverse evolution. Fitness allows for greater survivability of offspring and allows genetic material to be passed on at a greater rate. This is true whatever environment the population is adapting to.
So cave fish that have lost eyesight isn't reverse evolution? I read about an experiment with them where they implated new corneas in them (some scientists obviously have too much time on their hands) and they expected them to be able to see again. And I would think extinction was a type of reverse evolution.