Was Yucca not isolated or remote enough a destination?
I think in 50,000 years... human civilization will have either destroyed itself, or advanced so far as to solve the problem. Let's face it, no one needs to care what the mountain will look like a million years from now. If we're not flying into space by then - there's not much left but to accept our fate.
More to the point, why would Yucca need to be a final storage for this, if thousands of years from now we deem it unacceptable? It could be packed up and relocated after such findings, no?
It takes real modesty to speak of facts a million years in the future.