This idea of needing to protect nuclear waste for 10,000+ years is absurdist. Over this timescale there are threats that are just more dangerous [1]. What about conventional war over scare energy? That is a real threat.

And this argument is assuming that the next 100 years have absolutely no advances to a science that didn't exist 150 years ago. I find that unlikely.

[1] https://en.wikipedia.org/wiki/Global_catastrophic_risk