Well, for one thing it is good that ODF receives even more support and dissemination.
But on the other hand: Do browsers really have to be the "eierlegende Wollmilchsau" / jack of all trades? Once browsers would show HTML and pure text. Then images, which makes sense. Later sound. Well. And then videos by plugins, now by HTML standards. Then the buggy pdfjs came and now ODF while PDF isn't even completely working.
I mean, I am just worried about adding more ballast to the already heavy browsers (anyone remember FF being an outtake of Mozilla because they said Mozilla is too large? FF isn't faster or anything than Seamonkey today), and also adding more opportunities for bugs and security issues.
Still - if there is web editable documentary and stuff ODF is the way to go.
Stop TCPA, stupid software patents and corrupt politicians!