So each time this discussion recurs we get good restatements of the two or three points of view you could have about this. In general, I've held to the view that current ST3 bits work well for me, so I use them. I do notice the disinterest of the company that continues to take money for the software, but opt not to fret much, since the malaise doesn't have an operational cost.
I've been doing more work with Ruby, and I wanted an REPL to exec code from the editor. wuub's SublimeREPL might do that. Trouble is, it doesn't quite work in my environment -- throws "issues." It's not really right to bug the author, who clearly tells us not to expect new work on his extensions until Sublime HQ clarifies ST's future.
I also use some paid extensions. And notice that they, too, are not advancing. They work now, but the time will come when the environment they assume changes. I fear they won't have much incentive to adjust.
Extensibility is one of the editor's great characteristics. But without stable and active core bits, the ecosystem surrounding that core will surely degrade.