That's why my example is set enough in the future that none of us now would directly benefit.

For keys passed through generations, they'd be aware of changes and make transactions as necessary to signal that the keys are still operable.

The concern is more for those who are unconscious in cryostasis (Hal Finney being one of them) and any long time locked scripts that would prevent a spend between now and then.

I'm a hard No on any such endeavor to recycle unspent UTXOs with an age less than longest human lifespan.