I don't know enough of the details to draw conclusions, but I know one thing: the Gibbon River is crammed with Brookies. As posted earlier (see link), I caught 100 in 6 hours there this summer. Maybe that's a problem, but I thought it was wonderful! Great place for kids to catch something in a beautiful setting.
And if they're looking to return the place to pristine, start by ripping up the highways and parking lots!
I think things are generally beyond repair at this point. Let nature take it's course.