Google has been pitching its use of open standards as a way to insure yourself against Google going away. That's much appreciated, no sarcasm. All companies should plan for their users' data surviving them. But my concern is what if Google doesn't go away. This is a company that's at least heavily influenced by lawyers, if not run by them. They aggressively patent. Personally, I'd rather not build a new ecosystem out of Google patents.
If you have a choice of using an already-existing format or protocol that works just as well as the new one Google is trying to replace it with, the rest of us, who don't patent, are better served if we all use the older one, including Google. That way we know that we won't be forced out of the market at some future date, when the cost of staying in is paying huge legal expenses, and royalties, for "technology" we could have had for free.