If not run 0-100%, lithium ion batteries can have thousands of cycles. For stationary storage one can optimize the chemistry for long-term stability rather than weight and volume. A lithium battery doesn't just fail, rather it continuously uses capacity over the cycles used. So the rated number of cycles marks the point where it has 75% of its capacity left, for storage it can be used far beyond that.
On the grid scale, beyond large batteries, one can of course used pumped water storage - still the most efficient mass grid storage available. If really long-term storage is desired, synthesizing methane could be considered, which can easily be stored and then used to drive high efficient gas power plants.
This is glib assertion. You might explain how the economics of this would be accomplished country by country. Earlier this year the UK was without significant wind power for nine days. Well, in absence of fossil fuel, that would indeed be personal sacrifice - Old Testament style.
Almost the same with cars. Elecrical cars are a thing. And yes, while electric cars are different from ICE vehicles, this is actually a good thing. Why would people line up for Teslas, if they didn't provide the better driving experience? Of course, prices have to come down and so they will with larger production numbers. But switching from ICE to electric might be a noticable switch, but hardly a personal sacrifice either.
We have the ability to reduce our cabon footprint by 90% by just throwing existing technology at the problem. I fail to see why we shouldn't do that.