Regarding downvotes, I'll take a guess - OP's post says:

>[MS office] can use [ODF] as the default for all new files. At least since the 2010 version. If even MS recognizes that ODF has won, we have no reason to use OpenXML.

That leap of logic just doesn't compute... By the same token, since OpenOffice / LibreOffice can be set to use OpenXML as default, they've admitted that OpenXML has won. Being able to use each other's formats should be viewed as an attempt to move into each other's markets, not as declaration of victory.