FL killer ? I think there might be other games that expanded what FL did. Basically FL is just an arcade space shooter with no cool modern features, as in, planetary land-fall, base walking, planet walking. "No Man's Lie" was a good solid concept and could've done wonder if they were more inspired. We also have Star Citizen that, if delivered, you can have a very expansive space game experience.
FL is very dead as it is. The most populated server being Discovery with peaks below 90-80 people ? That's pretty dead for me in many ways. If it had a constant of 250 players as it had before, yes, it would've been something. But that's for another topic.
Returning, I think there are games that are in many ways better than FL and with more features that we would've loved to see here. Elite is indeed a complete game, as it can be in it's status. It can be better too.