Docx and Odt will live forever. 99% of the population will continue to use them. Hell I write hundreds of pages of documentation every year in Word 2010 and use LibreOffice at home because its easy. I use LaTeX for anything that is 'published'.

I hope we don't get another YML, an inferior and minute subset of XML's capabilities with all its problems and none of its advantages and tooling. I've used XML for years and once you understand it properly it's fine.

Call me old school but I find lightweight markup to be a hack job.