I don't know what is considered "successful" in the gaming world these days, but they did sell over a million copies of PC. The problem (IMO) is they spent a lot of money on updates and DLC, but the DLC clearly wasn't as successful (I doubt they sold even half a million on DLCs) thats why IMO they should focus on a bigger expansion

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However, I also realize a bigger expansion will take more time, and a few months back Bo specifically responded to questions about expansions saying "they were not going to release any larger expansions" which IMO really hurts the future of the game. I know they are focusing on JWE but I think the majority of our community is expecting some sort of Spring update, even if its something small.
On another note, I think frontier has done great with this game so far, I just really wish they would announce some bigger plans for later this year (or maybe even something for 2019). I think if people had expectations of something big being in the works (like say a water park or safari expansion) it would keep people interested in playing more, even if those surprises are a long ways away. If they are working on something then I'm not sure how secrecy helps
Then there is the concern of piracy, which I for one am sad to know that Denuvo was cracked. I hope that they can fix Denuvo for future development, because as a paying customer I feel we (the community) are the ones being hurt by piracy [down]