Never just cave in.
The might and power as corrupted as Microsoft is may yet find a path into the ISO which is not set up to combat this kind of perverse power. Yes, the specification is pure vendor lock in by design. ooxml is after all designed to give more control to Microsoft and to undercut the fledging yet superior odf ISO specification (international standard ISO/IEC 26300:2006) that is currently THE opportunity to finally halt the corruption that is Microsoft at the global level of document control and ownership by control proxy.
It is not in vain to try and stop ooxml from invading the world and continuing Microsoft's dreams of total control of all digital content. But even if it is not completely stopped, they can be slowed down by denying them fast track wins that were bought with outrageous and disgusting behavior.
It will require Microsoft to actually prove its "standard" with a long and actual development scheme that must stand muster. Or it may not make it if it must prove itself. At this point the fast track path is a marketing invasion over a standards body that is living in the past were truth and values stood for something. They don't have the guts to stand up against the vendors and governments who were paid off to accept the Microsoft money mercenaries.
England was not wrong to stand up against the German war Machine in world war two... England won in spite of having "no chance"... The unexpected can have a real possibility, but only if the courageous stand in the way of "unstoppable" forces.
ODF is a real open standard, and it is important to the future of print and digital data.
OOXML is a pure con job designed to give total document control to Microsoft.
The world has a real opportunity here to save hundreds of billions of (name your money) and give readability of the documents forever ( kind of like printed text )
ODF is like the printing press... you can see what it is doing.
OOXML is not. And if Microsoft were to just vanish one day... were would your documents be? In binary goober code no one but the Microsoft blessed can read.