What are they gonna do, add proprietary extensions? Nobody will support those. It's open, and it only works by being open. It's actually in Google's interests for it to be open, widespread, and an effective format because it saves them bandwidth and improves UX on their actual proprietary stuff like YouTube.
There's no protocol-level support, but all the communication happens over a socket and shared buffers, so that can be serialized. I believe Waypipe does this.
Well, it's frequently easier to kill powerful people than to remove them by other means, so the question becomes: how much benefit must it provide to justify killing someone, including how that compares to other options?
I hear someone's trying to buy the company, it's a big deal!