https://spectrum.ieee.org/energy/renewables/batteries-need-t...

Are we really going to risk human civilization on the immediate invention and mass fabrication of new storage technologies orders of magnitude more efficient then what we have?

And guess what, at that point maybe some of the newer, safer, and cheaper nuclear designs would have been proven so the nuclear plays we build then for the next few decades are better than the ones we would build right now.

We can build more than one nuclear reactor at a time, you know.

If you start now, it'll still take you almost a decade (or maybe it even will be a decade. You never know with NPPs because they always take longer and cost more than projected) and in that decade renewables will jump generations of development. In the end you just wasted money which could have been invested into true clean energy which is still improving fast.