While there are suddenly many space(/planetary) shooters on the market, there are differences between them. In particular, only Elite Dangerous and Rodina seem to have real-scale planets and seamless transitions, and the I-Novae Engine is probably more advanced than them.
And for gameplay's sake, the closest thing there is seems to be Allegiance, and it's more than a decade old (and yet, still played despite its Tarpeian difficulty cliff), as most of the space sims are single-player or multiplayer-sandbox. And the old ICP had some of the greatest feelings I ever got from space fighters, but I doubt this will be in the demo, alas. Newtonian physic + high-speed projectiles = win! And now I will cry over Shattered Horizon's fate.
So, with a 'playable' demo showcasing a real-sized and believable-looking star system, I guess that there is still something to get Infinity stand out even in such a crowded market. True, it may have received, say, ten times more money before SC and ED (and LT), but it doesn't mean its chances are gone, far from it.
All that said, I wish No Man's Sky luck, it looks like it may become a pretty fun game if they do it right.