No one claimed it was the perfect solution for absolutely everyone. For those who CAN use it - it is a great idea.
The Wright brothers didn't start out with a 747, Henry Ford didn't start out with a Lotus and Thomas Edison didin't start out with a Dolby Surround Sound system.
There are always the first steps. If people weren't willing to take those first steps - we'd still be living in caves and gnawing on raw meat.
I know. But in some ways these schemes make me think we're going back to the future. I'm old enough to (vaguely) remember my grandfather's farm that had a windmill to pump water from the well into a cistern. My Mom told me stories of how her father had no end of worries about running out of water during times of high usage and not much wind blowing. When rural electrification came in the first thing he did was tear down his windmill and put in an electric water pump. Sure, he had a monthly utility bill to pay. But he also had water on demand, basically at the turn of the tap. No more worries about not having enough water. That good old electric motor, powered from the grid, was always there when he needed it.
Availability and reliability seem to be the Achilles' Heel of any kind of system that depends on the vagaries of natural phenomena. Just the other night it was bloody hot and humid with not a hint of a whiff of breeze in the air. But I was very happy to get a good night's sleep thanks to the faithful old A/C and the reliable old grid. A windmill would likely have zero output under the same conditions.