Would it really take that long for people to forget local time and meridians was even a thing? I'm not generally interested in big or frivolous changes, but my god, having the entire world on one clock would save so much grief (mostly internalized so we don't even notice the annoyance anymore). I saw we suck it up, and do it for future generations.
I spotted a few straw man's in that post. To think it would be hard to find out when the sun comes up in Australia is pretty ridiculous in the information age. I'm constantly meeting across time zones and it's no less difficult (moreso with DST).
An interesting comparison would be dates. January in Sydney is summer time, and you just have to know that you aren't booking a beach vacation there in July.