I continue to feel some regulation is appropriate
Perhaps licencing for ALL power-boaters ?
perhaps some some education requirements for youth sailors (much like the current requirements for under 21 year old who use a motor boat/pwc - Florida Boating Safety Education class)

But the limit of 10' sailboat for 16 is just not needed
Hell, i sailed a laser at camp (age 12-15), solo - with no adult within a few miles (on a lake)