Additionally we will need to live with a supply constrained electricity net. Sometimes there just isn't more available and variable pricing will be needed to reduce demand. Of course the Texas power crisis showed that even if prices rise 50x some people will stubbornly keep using power regardless and basically go bankrupt. But perhaps this is just because nobody is used to actually matching demand to supply vs the current situation where supply is always matched to the demand at all costs with (rolling) blackouts as the only effective measure to reduce demand.

I imagine that in a near future where most cars are electric (and thus transportation is a significant part of electricity demand) it should be quite easy to temporarily reduce demand, even in winter: just stop commuting for a few days (at least all office workers). Also big industrial consumers could be incentivized to reduce demand when supply is too low. It might require some design adjustments, but shutting down most industry and working from home for say 0-5 days a year is surely more cost effective than massively overbuilding renewable energy supply, making giant batteries.

Priorities should probably be 1. More grid interconnections (even out supply variability), 2. cheap long term storage like hydro, 3. demand reduction. I think we need all three to transition to a 100% fossil free future.