I know little about EE (and I'm certainly not speaking for anyone but myself), but I believe Java EE has lost dominance not because of any corporate decision, but because it simply started losing ground to unstandardized open source projects [1], as opposed to EE's JCP. So people who liked EE wanted to ditch the slow-moving JCP in favor of a faster process, and one question was whether the new project will be able to change specifications of namespaces that are traditionally reserved to, and associated with, the JCP. In the end it was decided that no, they will not be able to change JCP namespaces (but can choose to maintain them until the end of time in addition to any innovation they do outside of JCP namespaces). The decision obviously disappointed some, but I don't think it's viewed as catastrophic (although some may think so). And I don’t think that the “negotiations have failed” so much as that either side wasn’t able to achieve what they believed was the best outcome for them, but an agreement has been made. You also need to realize that it wasn't a negotiation between Oracle and some grassroot project, but among multi-billion-dollar corporations, some of whom have fought Java standards for over a decade, so the process was both legally and politically complex. But now everyone can move on.

I, for one, am curious to see how Jakarta EE's current approach of what seems to be an internet-based, democratic semi-standard would work out, and if it can be better than both the JCP as well as more common centrally-controlled open-source projects.

Anyway, this is what Eclipse's director said on the matter:

https://twitter.com/mmilinkov/status/1125213654775889921

[1]: That post you linked to reminds me of those who blame Oracle for killing Solaris. Solaris is a terrific operating system, that was sadly killed by Linux long before Oracle acquired Sun. After a few years of trying, I guess Oracle decided they could no longer save it, and there was no point in continuing to throw good money after bad.