Given the large number of hunters in PA, which means a lot of places have high hunter density during deer season, and with growing development, and the urge to 'spray and pray', a ban on semi-autos seems reasonable. It's been in place a long time, before hunter orange requirements and hunter safety classes, so a re-evaluation might be in order. I don't have a particular objection to it.
However, it's how we hunt in PA, and I doubt this will change. As for me one bullet = one deer.