The reason it will never happen is simply down to math. The numbers we are dealing with here are unimaginably large. For example, if every human on the planet each generated 1 million new addresses every second, and had been doing so since the birth if the universe 13.7 billion years ago, we would only have generated approximately 0.0000000000002% of all possible addresses.
Thanks for these numbers. I see a lot of "get rich fast" posts/questions from new members to this forum lately in which they think it is possible to find private keys to well funded addresses by bruteforcing. I think most of these questions arise when people just don't have a grasp about the near infinite possibilities. So I'm probably gonna use your number example as reply in the future to point out there's a difference between "theoretical possible" and "practictal feasible".