I completely agree with this sentiment. LaTeX is far too complex for what needs to be highly accessible and Markdown, while super easy, is too limited for showing things like complex data sets (or really even simple ones to be honest).

The biggest problem with the idea of getting people to make a new format is essentially this: https://xkcd.com/927/

What's to say the ultimate result will be something most think is usable? Design by commit is rarely the answer as well.