Nuclear is one possible alternative... in the future. But that ain’t happening. Not for decades or centuries...never.
As you point out, “never” is probably when that will happen.
My step brother is involved in a nuclear alternative start up company.
Almost everyone in that industry is completely dependent on government funding.
There are a few companies sponsored by Billionaires - one by Bill Gates for instance.
LOL - I can recall a family vacation in the 1950s when we toured the Oak Ridge National Lab, walked through a room-sized mock up of a nuclear fusion reactor (The Future!), and then put dimes (supplied by my Dad) into a machine that “radiated” the coins and encased them in plastic!