I now you are fired up about it but I still would disagree with your analysis. I actually think you missed fishsqueezer's point.
If you catch a fish any time of year, it cannot spawn the following spring. Just because they are speared in spring, the entire previous year fish were being taken away from having a chance to spawn the next spring. That's why the argument isn't a good one. Its like shooting a Doe in September but saying its bad to shoot one in December. Still a dead deer and can't reproduce. Same thing with fish.
When they spawn, sure its fish in a barrel. Like you said they spear in a few days. The rest of the year hook and line guys take fish. Slower paced, but they have 300 days to do it. That adds up in a similar fashion. Bag limits were reduced to account for the spearing, so similar amounts of fish were still being taken. Do some indians violate? Sure, just like the possession limit violators, always someone. After the yearly fish are harvested, go back to my first paragraph.
Personally I think hook and line anglers were already starting to piss pound the walleyes and spearing just helped put it over the top. Things were probably not adjusted properly to account for it all. Years ago when there would be 30+ boats on some of the popular lakes for opening weekend, how many fish were taken? Everyone talks about the lack of tourists compared to years ago in the northwoods. That means there were more people than now taking fish home prior to spearing even starting. That's why I think spearing just put it over the top, we were headed there anyways. If spearing didn't do it, technology would have.
Did you hear about the bite on Big Arb? Here's how I did it and where I was. Next weekend = 100 people.