Enforceable?
Tough to enforce as a "primary stop" since nobody can see the lanyard. If you get stopped for some other reason, stand up to get your wallet/registration, it may be obvious, but not if you have it on your wrist as described above.
This is probably a good idea, especially if you like "Nanny laws", but like seat belts and M/C helmets, no special law will change much. Eventually, mfg's will put a pressure switch in the seat as an ECOS, just like my lawnmower.
Recall, not so many years ago, a single operator was ejected when his steering failed and the boat turned suddenly. The boat kept running in circles, but it was some time before the operator was found. No PFD! When you're alone, where a self-inflating PFD.
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