Any energy system large enough to power the world will be a very expensive thing. Fortunately, the world economy is also a very large thing, and can pay for it.

We can say with some confidence that while this renewable energy system will be expensive, it will be less expensive than a nuclear energy system that serves the same purpose, and likely cheaper than a system with any substantial amount of nuclear energy.

> Given the lack of commercial built and operated hydrogen wind farms

This is a completely bogus argument in an environment where natural gas is still plentiful and legal and its carbon largely untaxed. The CO2 tax needed to get to wind farms + hydrogen being competitive is likely much less than the CO2 needed to get nuclear to be competitive (against natural gas).