And, when that fails EVEN after it did become an standard, take over the other one (ODF) which is not of stellar quality either. I shudder to think of what the already hideous ODF will become in five years.
The more I see of it, the more I am convinced that SGML or a human-usable restricted set of it (say, Docbook, and nowadays DocBook XML and XHTML strict) is the only thing we can really trust to endure for 20+ years.
That, and TeX (and LaTeX) documents without too many obscure extra modules. Go figure!