I don't believe that the MDC shocking walleye in the rivers has any effect on them or on any other fish. I think you are trying to attribute way too much intelligence into a critter with the brain the size of a small marble. I know of some very small rivers that are sampled by electro shocking every year, but still because they are driven by biology, the fish come back to spawn. Nature tries its best to find a way, but sometimes the conditions just aren't there.
Because it interests me I have been trying to find articles about lake spawning walleye, they are few and far between with mostly conjecture and little hard biological data. Some suggest that walleye will seek out the streams where they were hatched (sort of like salmon), others talk about spawning on reefs or gravelly points if the wave action is sufficient to keep the nests clean of silt. One of the more interesting things I found on, I believe a MN DNR site, was about if the water temp warms up too quick the eggs will hatch prematurely, thus greatly reducing the success of the spawn. It is quite believable, to me any way, that the further south you go, the waters tend to warm up more quickly and reduces the success of the hatch on those that do try to spawn. and I agree that it doesn't take a very large creek/river to attract the walleye they do need to have some water movement/current or they don't want to move up the tributary. I wish I was back in college and could figure out a way to do some walleye research for a PhD.
MDC will not change the regs unless they have some science/data behind it to back it up. I don't believe that there will ever be enough natural reproduction to make much effect on the population as a whole, it will always be mostly a stocked population in the lakes.