Airport? Conference? eduroam?
Honestly, how often is wired internet even available in these situations? Do you want to wait in line for a booth with wired internet at every airport and con and conference and ted talk? Should we be adding an RJ45 in the back of every convention hall chair? The logistics you're describing are untenable, especially in light of wifi's existence. The beauty of wifi is that many people can connect from a single point, without being tethered to a cord. That freedom is worth the latency for all but some of the most critical tasks. These are the problems wifi was invented to solve. It sounds like you're wanting to return us all to 1999.
Am I missing something in your post? Because based on your complaints it sounds like we'd be better off if we could solve some of wifi's issues, instead.