I use ODF but no-one else does because MS Office doesn't properly support it, I'm crippling my ability to share documents around purely for ideological reasons.
Microsoft OSs are down to 14% market share.
It simply makes no sense to continue using their outdated lockin-inspired formats. The world needs to transition to document editing formats that're portable across whatever computing devices users want to buy.
ODF was designed by the Organization for the Advancement of Structured Information Standards (OASIS) consortium to be that set of formats in 2005, and was only derailed by an intense and deeply corrupt effort by Microsoft. It's incredibly sad that we've had to wait for almost a decade for governments to finally start the transition.