Paper will go away when a more convenient medium comes around. We do not do our accounting on clay tablets anymore, laws are no longer set in stone, papyrus and vellum have been set aside for that flimsy, perishable paper thingy.
Any reasonably flat surface can and has been used for writing. Something more durable and easier to 'program' (i.e. to write on) than paper surely will come along.
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