It's not like old books are particularly rare and fragile either (although many which did not use acid-free paper can deteriorate quite rapidly); I have a few from the early 19th century, which are still in good condition.

(They have also been scanned and are available on archive.org; the copyright is long expired and they're public domain.)

Yes, and you can buy a new e-reader and read all those same books.

A kindle is more like a bookshelf from IKEA, it has a finite lifetime.