And I'll pre-emptively add that I've mentioned about 3 or 4 times already that there's a scenario that involves the possibility of exclusively banking on renewables, and that scenario is the de-growth mentioned in my very first post too. It is entirely possible to go there (and in fact, it is where we're bound for ultimately from a purely physics-based understanding of fossil fuel depletion, which includes uranium and therefore nuclear ending too).

So the real question actually will be one of consumption (of goods and energy), and if we're willing to ask and answer that question before we reach critically low levels (so at an absolute stretch within about 2 centuries) then we will be in a position to totally live off of energy sources that we can approximate as infinite (much more robustly so than what we did with fossil fuels, since the sun and wind for all intents and purposes would not go before we do).