Just a thought?!!
My boat isn't on plane at 30MPH. So that puts me making one heck of a wake for all the "blow boaters" and a playground for the "water flies" (jet skis) at 40 I start to clean-up.
So a mandatory "speed" could actually cause more of a problem than it will solve.
Enforcing the NO WAKE zones would make more effective control.
I can't count the times I've been in a no wake zone and had a "bass boat" or jet ski fly by me, thinking that they don't make much wake.
My .02 worth.
I'm interested because as soon as the laws start in one area the others have to get on the band wagon.
We're regulated to death now.