I don't think FFS is hurting crappie populations as much as some people think. Just because you can find them don't mean they'll bite. I Crappie fish Lake of the Ozarks and most days I don't keep anything and might catch 50 keepers and I know a lot of others that do the same. But I know people that will take three or four people with them just to keep a lot of fish.
I think they need to raise the length limit on certain lakes in Missouri and may need to do like Mississippi has done on Grenada and have a limit per boat. No matter how many people are on a boat you can just have a certain number of fish.