Where and how do you store your "index"? The number you wrote is multiple orders of magnitude higher than the number of atoms on Earth. It's not simply "not happening any time soon". It's physically impossible.
This is like saying the Library of Babel[1] contains every book ever written, past present and future. Yes, it's technically true and a fun thought exercise, but it's not a threat to the publishing industry.
Edit to add: just found https://keys.lol that does exactly this, but generates a few dozen at a time and doesn't store the results.