I am intrigued with the idea and reasons why natives may be reclaiming their prior territory.
It would reason that the Southern Appalachian brook trout (specks, char, whatever the nick name one uses) evolved over thousands of years in this environment and are better suited to the waters in the Smokeys than other species. For example, the warm summers, low water flows, droughts, and occassional flash floods are all part of the Smoky Mountain streams. I'm sure some of those conditions also exist where Rainbows and Browns are native but the specific envronment and ecosystems of the Smokys are most likely unique to the area.
I have to wonder if, all things being equal, as the streams and surrounding forest recover from the thrashings of man like logging, and farming, the brookies may steadily reclaim their former range without much intervention from humans?
Being 49 years old, I doubt if I'll be alive long enough to see that process fully take hold, but I would have to wonder if in 100 years, most of the streams in the Smoky Mountains are primarily brook trout streams and the rainbows and browns would be the rare find?