It has always seemed a waste of effort to me. If some primitive post-dystopian human were to dig hundreds of meters through salt (!) and come into contact with the waste they would be rapidly educated as to the hazard and go find something better to do. Anyone less primitive should have no trouble interpreting some straightforward pictographs preserved on a few strategically placed brass plaques embedded in granite. In the meantime surround the site in stainless barbed wire and perform routine inspections.
I guess it was kinda fun thinking about this `problem.' Once. Long ago. But since then it seems to have just devolved into a boondoggle attracting an ever greater circle of paper writers. Meanwhile, with all of these great minds sweating 10,000 year hypotheticals, the actual handling of waste is down to yahoo contractors mixing high level waste with randomly procured cat litter, producing nitrate fueled nuclear waste explosions...
Priorities. In order. Not.