As far as the DEs being distributed from a small used book/video store, not sure how that would work. Wouldn’t one have to sell it?
As far as using it as a physical place of storage, nothing wrong with doing that, but it doesn’t seem like that would that help with either length of preservation or the scope of distribution.
I wonder if, again, perhaps decades from now, some sort of trust could be set up, charged with keeping the DEs accessible? Would that even be legally feasible?
Brainstorming in terms of generational time spans is difficult with a project as unofficial as this site’s is, but I think it is important.
As for Pluto, I doubt it. 😉
perhaps donating them to libraries might help until a more permanent option can be found.