An estimate of 78,000 turbines is truly a thought experiment, not a realistic solution. There does not exist manufacturing capacity or installation capacity to achieve this (not even remotely close). The offshore wind pipeline, globally, is orders of magnitude fewer WTGs, and procurement & installation pressure is already expected to be very tight in the coming decade.
This is made more difficult in the US due to the complexities of offshore wind installation imposed by the Jones Act.
It’s a neat concept. But it will never be realized.