Sauger are very fragile, and highly dependent on certain river currents for adequate spawning success. Was about a ten year period in the late 90's/early 2000's(if memory serves) where currents were not adequate and it took a mortal toll on Sauger populations. I haven't caught a keeper Sauger in many, many years. Used to come home with NICE limits regularly from WB and Hiwassee. Now, if I were to catch a keeper, I'd release it.
Walleyes have reached sustainable, fish-able levels, reach much greater size, and are still being stocked every year. I still have not got an educated-answer whether or not they are successfully spawning in the tailwaters every year, but have had many successful trips in the last 5yrs. Would post some pics, but hate fighting with that on this site.
I think Walleyes are here to stay, and I'm just fine with that.
*EDIT: think of walleyes like mature adult buck whitetails - You can on rare occasions catch them during the daylight, but they are by nature a nocturnal creature. Night time will most always be better for harvest than day time*