the reason you don't see many LM/SM hybridization is their spawning habits are different as is their home range (for the most part)
if people are catching lots of largemouth then they are doing it intentionally...and if they will do it during the new smallmouth open season, then they mostly have already been doing it for years and poachers are poachers..they will police it the same way they policed it in the past
I don't really see the problem
but maybe I'm not looking hard enough....lol