Congratulations on this! As a hobbyist search engine enthusiast I’ve really enjoyed following your project and blog posts these last few years. I’m looking forward to what the next year brings!
Here’s one analysis that takes those factors into account, and eReaders still come out massively on top on average.
Paper isn’t the problem, it’s the fact that’s books are heavy and bulky, so the transportation and storage have massive carbon implications.
On top of that, most books end up in landfill as a result of not selling in stores. If you care about the environment and read books an eReader is a worthy investment.
They almost certainly will, as has happened before (see Ethereum classic) but the Ethereum foundation and thus most of the users will continue on to the proof of stake chain.