Apparently people keep forgetting who pays the majority of OpenJDK developers.
Because actually OpenJDK isn't 100% 1:1 to the closed source versions.
Which of those listed companies would try to keep OpenJDK alive and drive the JEPs?
The question should rather be: Which of those listed companies will Oracle sue for doing so?
RedHat is now supporting .NET, IBM made J9 modular for other languages like PHP, Ruby and Python, additionally improving Swift on GNU/Linux.
I actually doubt, that given the interest other companies have shown regarding saving Sun assets, anyone would bother to pick up OpenJDK afterwards.