Joke aside, I want to say something controversial here: I don't think the release date/progress matters much anymore for the dev team at this day and age. At least not as matter as it used to be when the game plan was just announced. The same point is somewhat true for their backers: they are not in a hurry as well, they want to (emotionally) see Star Citizen success one day (Or they just don't care anymore).
(Assuming they're actually building a game, instead of doing something else with that money, of course)
Remember [Freelancer]? It was released back in 2003, some people are still playing the game today, and they even go as far as creating an open source version of it called [Librelancer].
[Freelancer]: https://en.wikipedia.org/wiki/Freelancer_(video_game)
[Librelancer]: https://github.com/Librelancer/Librelancer
The scale of Star Citizen is way larger than Freelancer, and the potential of the game is greater as well since you can do many things in the game. If one day Star Citizen releases and delivered what's promised, the game will last for a very long time. So for the fans, the wait maybe worth it.
(And hopefully it will be released before Elon Musk, NASA, ESA, CNSA or ROSCOSMOS etc give us the real-world version and make us actual 1-heart space-slaves LOL)
For the non-fans, however, the market is largely fulfilled by Elite Dangerous, No Man's Sky etc.