> The replacement will not be leap minutes but leap hours.

People have a hard time with leap years, which happen regularly every four years, so I'm curious to know how well a "one-off" event at a basically random time in the future will work.

The actual rationale here is that it's not worth trying to figure out whether a hypothetical leap hour in a thousand years would be worth it, or how to pull it off if so, because no advance preparation for that scenario that we can do today has enough value to outweigh our ignorance of what the world will look like then. If they decide not to do it, they can just change the rules again; there'll be plenty of advance notice.