I don't much care either way on the slot.
I do disagree with the attitude of the big ones not being any good to eat, though. Simply trim up those hogs and you will not tell the difference. If anyone disagrees and wants to get rid of some big ones, just give me a call when they're fresh, I'll take them off your hands
As for walleye reproducing, if they are anything like women, the old fat ones don't produce many offspring at all (thank goodness) LOL