I think you are quite correct, OP. When it comes to what I like to call a sober-minded space game, Elite: Dangerous seems to be it for the moment. And looks to remain so for quite some time. Sure, the game has its problems, and I have certainly joined in on more than a few gripe sessions, but ED is quite the accomplishment as far as I am concerned. It is very much the space game I've wanted to play since the golden era of space games closed so many years ago. For that alone I am always cheering Frontier on in this effort, even if sometimes it is through gritted teeth.
The only possible threat in the near future is X4. Egosoft have learned a great deal from their Rebirth fiasco, and seem to be taking a very ambitious, very community-driven approach to X4. I suspect it may well prove to be a big winner as I think it is more likely we get a game that resembles X3 much more than Rebirth - i.e., a new classic for the genre. Fingers crossed.
Even though Hello Games has done yeoman work rehabilitating NMS, ultimately I don't see that game resembling anything more than a Minecraft in space. That is fine, btw.

I like the concept. But Minecraft in space is never going to be a competitor to a game like ED, no matter how fun it may prove to be (so far I only find the game intermittently amusing).
As for SC...well, no need to rehash everything going on with that project.
And as for the other games that are in early release / alpha / or just announced (like Starfield), I've seen too many such games over the last few years never even make it to the launch pad (remember the hype around Limit Theory?), let alone get into orbit in any shape resembling what was initially pitched. I hope some do, but not counting on it.
Space game enthusiasts often like to suggest that the only reason we have had a dearth of space sims is because of some sort of console-centric conspiracy, or some other grudge against PC gaming and sims, but the truth is that making a quality "AAA" space game is almost on par with volunteering for a suicide mission. The failure rate is tremendous - again, just look at all the space games announced to much hype these past few years and compare that to the number that actually made it to a proper v1.0, not to mention a FUN v1.0. Really, despite countless attempts, only a handful ever achieved any sort of lasting success: the Evochron series, the X series, Eve Online (the most successful by far), and now Elite: Dangerous. That is probably the most exclusive club in game design. If you're running a game studio, making a AAA space game is a surefire way to wreck your business.