They won't be able to read the records due to physical bit rot of any public archives making it through the narrow path to the future, and of course the absence

They won't be able to read the records due to physical bit rot of any public archives making it through the narrow path to the future, and of course the absence of most material behind paywalls that won't be in any public archives that substantially survive. They'll get more from acid-free paper archives under mountains than anything digital I expect.