That'll sort it itself out over the coming decades; but the other interesting one to me is that a sizeable group (majority?) of people are still saying "two thousand nineteen" instead of "twenty nineteen". I'm pretty sure I stopped using the former shortly after 2009 ended. I wonder if that'll stick for the whole century.

In the other language I speak fluently (Portuguese) there never was an abbreviation, it was always the full "one thousand nine hundred ninety" as opposed to "nineteen ninety". In that case "two thousand" is already an improvement, but for some reason it bothers me in English.