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Nitpick - leap years are every four years except on years divisible by 100 unless they are divisible by 400.

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.

We know how that would likely work-- should we chose to do it: New timezones are created from time to time for political reasons already and can nicely accommodate this case.

I don't know that people in 1000 years will feel the obligation to follow through with the leap hour at all.