@wrog Interesting, though I think the Gregorian calendar is Good Enough™ at this point, and changing calendars would do more harm than good.
We won't be out of sync with the solar year by a margin of one day for another 2900 years. By then I fully expect us to either be extinct or at a level of technology where the seasons on Earth are not that important. Even if they are, there are still tens of thousands of years before things other than "hmm, the equinoxes seem to be off by a day" start to become obvious.
@pganssle
yeah, this is more of an If I Were Dictator thing (I'm far more worried about the concept of leap seconds not dying out soon enough)
though things are going to be somewhat fun when Gregorian and Revised Julian get out of sync (2800 AD), assuming Catholic vs. Orthodox is still a thing then.