Yeah they are just insane whishfull thinkers.

I calculated the costs of covering the needs of Germany for a 2 days low production event (as it happened between 6-9 december) and you would need about a trillion dollar. That's for something that cannot even garantee you more than 48h of runtime for half the country's needs.

You would need at least 4 times that to be safe. Even if batteries price are divided by 2 (very unlikely, there are large fixed costs) you would need trillions of dollar for a single country. That's just not happening any time soon and even in 30 years time, I doubt it will be that prevalent of a solution.