That's not a major problem long-term IMO. Solar power can be stored at home or at grid-level, charging can be scheduled to coincide with daylight hours before/after work, EV batteries are getting bigger every year so they need to be charged less often (which means more flexibility with what time they're charged), overnight also coincides with low-consumption hours for the grid which has its own benefits, V2G and V2V even allow parked electric cars to potentially become solar storage batteries for a smart grid and other neat things in the more distant future.

This is just a round about way of accomplishing the same goal. There are much better clean energy investments that will have payoff sooner and will benefit more people, not just those than can shell out tens of thousands of dollars for roof solar and a power pack.

It's expensive right now because demand is low. When everyone is buying solar, I'm sure the price will drop even further. This could still happen in parallel with any other clean energy investments as well.

There aren't that many clean energy options available to the end consumer right now, other than solar. You could have a wind turbine which could run day/night, but they're just not as cheap per watt, and has far fewer competitors on the market making that stuff.

For charging at home, yes. (But that's complemented by wind, which often blows strongest at night.)

If you install workplace chargers, though, you can charge at peak solar production.

Yes, and baseline power plants will be burning fuel no matter what. Might as well put them to some use.

Or the money could be invested in power storage making those baseline plants obsolete.

Plenty of wind at night...