Thing is OTF, I feel that I see less stringers now. I wish I saw none, but I really don't believe I see anymore. fortunately the younger people entering the sport are getting a different message than many of us did 50 or 60 years ago.
Of course if you start adding in people tramping through riffles destroying the insect population, pulling gravel out of the bed, cutting vegatation to within a few feet of the bank destabilizing them amd elimiting water cooling shade, and the list goes on. Jet boats can't be ignored because they cause waves that run counter to the rivers flow and loosen material.
The bottom line is I don't think it's a misuse of the fish, but the environment they need to thrive in. Over fishing is relative and depndent of the resource available.