Paper's never going to be replaced but I have definitely wished countless times for something that could copy a paper for storage instantaneously.
(Given Wacom's technology with cintiqs, I'm actually surprised this isn't a thing already.)
The reMarkable is probably close to what you're describing. People who use them love them, but I'm still a fan of real paper and ink.
[0]: https://en.wikipedia.org/wiki/Fly_(pentop_computer)
The reMarkable was supposed to replace notebooks, but I gave up on my reMarkable 2 after a month.
Paper's never going to be replaced but I have definitely wished countless times for something that could copy a paper for storage instantaneously.
(Given Wacom's technology with cintiqs, I'm actually surprised this isn't a thing already.)