I really hope this lands and something constructive can come out of it. There is a lot more that can be gained by these communities working together and not promoting divisiveness.
Adding a PR with working code was simply to show that adding this feature is something that is possible. It is OK if nothing from this implementation gets merged.
Gained by who though? These are for-profit enterprises and there are real-money gains involved in controlling the spec. For better or worse, CoreOS controls the App Container spec and make no mistake that the primary reason they want it in Docker is because it benefits them. This of course does not exclude the possibility that users benefit.
Still, I'm of the opinion that all of this fighting behind the scenes (which, if you've been paying attention, this is) is kind of bad for everyone and a waste of resources.
But I think that this VC-backed model might not be beneficial for OS as a business in the mid-long term. The race to $0 is greatly accelerated.
However, after reading "This is a simple functional PR..." in the blog post, I was surprised to see the PR adds over 38k lines of code. Seems like that will take a while to review.