This is the public dividend of a standard finally winning. The article gives credit to Unicode, but it is the fact that ASCII unambiguously won that gives plain text its portability and longevity. It looks like Unicode is on its way to winning in the same way, but it is not there yet. Most text files I write are still pure ASCII because that's the only way to avoid unexpected glitches [0].
[0] Windows newlines not withstanding.