The SteamSpy guy seems to disagree with your comments about early access though, or at least the bits about popular genres in early access (FPS and rogue-like are far from popular if you check the tag cloud - fortunately for you, Survival seems more popular than both of these :-P) and there isn't really a "second launch". He wrote about it before too, but this article has the data to prove it - with the caveat that if you failed your first launch you *might* do better in the real one. I think you should wait until some time after you release your game to decide if it was a good idea or not :-P.
Personally i do not plan on using early access because, well, i don't like promising things while i'm taking money, mostly because i might not finish them :-P. Also i don't think it would make any difference if i built a community in early access stage vs in finished stage, if anything i'd expect the latter to be easier because people will see the final game not the patches, stitches and standins in the wip version.
And above all, i wont have whiny people complaining that i exited early access to early :-P