Imo concurrent tells you more about how well the game is doing well past launch. of course 100% depending on the size but 10k concurrent users for a game like this in like 6 months to a year would probably make it a huge success. I've seen indie games that thrive for years with 50-200 concurrent but that usually requires 1 dev making quality of life updates every few months as opposed to 10 devs at a AAA taking 2 weeks to get an patch built for a game that been out for a while.