If you think about what happened as some waters, particularly salmon and steelhead rivers had fly fishing and or no bait regulations put in place, anglers opposed to them organized and started to lobby MOE and DFO.
Much the same thing may happen with jet or power boat bans. Boat companies and dealers make serious money. Boat owners spend serious money as in 10s of thousands for a new boat designed to charge up white water streams 50 feet wide and 1 or 2 feet deep. Though once a serious accident occurs public outrage may overwhelm any such organizations.
This is not the 1st thread on the topic and I can't help wonder if that motivates some boat operators to run the river when they might not otherwise do so.
Then there is the "I paid the big bucks to get the boat so I have the right to use it where and when I want!" I hear that all the time.
Money makes might & might makes right.