There's more to grid demand than baseload and, at least in America, the peak production for solar is the daily demand peak for electricity.
So much of the South and Southwest is prime for solar and as yet has only made modest use of it,even in California. Texas has many GW of wind farms but almost no solar by comparison, a shocking oversight, given that they sometimes go months without rain and stretches of days above 100F.
Why assume that the cost of spinning reserve has not or is not being factored in? The utilities were gaming the system to get paid exorbitantly during times of high demand and now that the renewables are eating their lunch, they want to take their toys and run home?
I'm tempted to say let them fail - and then their assets can be had for pennies on the dollar by someone who takes the long view.