I went and purchased Starfarer/Starsector last year, and have to admit after playing it for around a dozen hours - it was interesting but too incomplete to hold my attention.
Given the update schedule, and the emphasis on patching in modding features above the story/campaign, I probably won't invest any time into it or the community following it until it is completely done.
I'd like to get involved in the game, it just isn't there yet. When I originally played it it amounted to a space combat sim in a single sector. It looks like Alex has a lot more planned for it, including a SP campaign.. he just isn't anywhere near there yet.
So while there remain a lot of hopeful people out there, I expect many of them have just shelved their expectations for the game in the meantime, and who aren't paying it any attention for obvious reasons. That may be good for Alex (less pressure), but bad for the game overall (less buzz and community surrounding it).
Anyhow, that's my .02, I remain hopeful for the eventual completion of the game.