Of course we always want things to be as safe as possible, but the longer lived an isotope is the less radioactive it is. At some point this waste is going to be less dangerous than naturally occurring uranium deposits. Maybe that is the 10,000 year mark they're shooting for and I'm just ignorant but if it's only 100 or 1,000 years then it's possible we're being more paranoid about this than is reasonable, especially since all of this material is sitting in temporary storage now.