No need to watch https://www.youtube.com/watch?v=bvpEzWGVk94&t=610s for daddy's going to summarise, but it touches upon a demographic decline in boating.
Far and away the largest market for recreational boats in particular is the US, as it's long been for recreational aircraft.
And in both cases ~ as with truck driving ~ the median age of ownership has drifted upward for years and not least because of ever-growing capital and operational cost only readily affordable to retirees for instance.
And the reason he says that neither boats nor outboards have changed much in the last decades is because compared to automobiles (of which 80 million are bought in any one year), sales won't support either innovation or automation of manufacture.
As a result, boats remain largely hand-made and in materials that have not changed much in years (unlike owners) viz. sheet alloys or glass and resin composites laid up or finished by hand. Do put your hand up if that sounds familiar to the light aircraft industry in the US too, Burt Rutan excepted?
Our vlogger also points out that both industries ~ where it applies to crewed craft ~ are fairly heavily regulated; and I would add 'whereas teenagers can fly simulators for free with just as good a view out front and no danger of dying in the process'.
Here's the kicker, however... none of the foregoing applies to drones, which is why the annual production of multicopters now exceeds the number of flying machines ever built throughout all of human history. (Ed. he hasn't checked that as usual but suck it up).
Taking our current build we're using no material that isn't either innovative or mass produced. Regulation, licensing and liability are either absent or the more affordable and there is no risk of drowning where it involves driving a drone from the comfort of a cubicle.
Thus it is that the seas will sooner or later be littered with disposable drones going about their business, as the skies will be filled with airborne drones doing much the same thing whenever they don't happen to be raining terror from unlimited confine.
It's worth then taking a punt on whether maritime drones will ever outnumber that population of crewed vessels, though nothing would likely surprise those old enough to afford an airplane...
...or boat?
