Bob, interesting point, but I fail to see the stringency of your argumentation. The point of Barclay's is the collapsing monopoly. Currently, utilities still own the lines to their customers and can essentially charge them for that whatever the regulation allows. Plus they had a lot of market tricks to sell cheap electricity for a high price, just by holding the cheap capacity slightly below the market demand, such that marginal costs of high price production (usually gas turbines) set the market price. There are countries like Germany, where those parasites have sucked out net profits of >500 dollars per year and inhabitant in the past. Industry demand has never been good business, because industry is large enough to produce their own electricity if they want to (or in other words if you squeeze too much).
1) overall price: So, now they face an increasing number of customers, who can just get out of the grid essentially and live from PV + batteries, Solarthermic plus warm water tanks, or even entire villages that set up their own solar, biomass + wind production. Those solutions set the new price, at which big electricity companies can sell. So, even if you can increase the nominal market price again, you have the problem that your customers run away if you sell at the market price.
2) market price problem: The intrinsic problem of solar and wind for them is that they will go far into overcapacity. I.e. the times when an expensive production unit may set the market price, will be miniscule compared to the old "every day" situation. Wind and solar are also far more flexible - you can just shut them off. Leaves you with large-scale fluctuations on the timescale of days, and those are covered by "cheaper" production plants. To cite your example, Germany again: The variability of required capacity outside the regenerative sector has increased a lot, but still the gas turbines went out of business. And worse: storage is getting cheaper, pushing their old expensive crap out of the net. Last, but not least - if regeneratives take up a part of the share (and they now do practically every day even on bad days), the basis for your cheap production shedding the money gains, just shrinks proportionally.