I am sure many thought like this about Horizon vs Vanilla too, until they merged them, and now Vanilla players could land on planets.
If we were in alternate universe where Odyssey DLC had Mostly Positive reviews on Steam - sure adding more content like new types of atmospheric planets would have been great for sales - but when your one and only, at present time, DLC has Mostly Negative reviews, you would want to put an end to it, and simply start over with a fresh new DLC.
So what ever new big content package they have in mind - it will probably not be in Odyssey any longer. That ship has sunk so deep that 13 updates later, players are still not happy with it.
I think enought is enough. They tried to fix Odyssey, it failed, time to move on - would be the best strategy. And the fact that SRV went from paid to free content - probably point to a direction that they are thinking the same.