I understand you feel very strongly about four digit years, but I really don't see any situation that I couldn't sort out with a simple script.
Usually I don't put dates in file names in the first place, but when I do I use the UTC timestamp; a date without a timezone is inherently fuzzy, and it's easier to compare and differentiate numerical times.
If someone used two digit years in their naming convention I wouldn't even blink, let alone get the woodchipper, life is too short to get angry over stuff like that.
We're just talking about the filename, the exact creation time is tracked by the OS. Plus I'd imagine most documents also have a time and date inside. The file name is mostly for sorting and human readability.