I posted that the end of March, which was a week and a half before Daredevil Season 1 even premiered, let alone the news of Season 2 happening and getting a firm idea of its release (likely April, 2016).
So at the time, I thought that. Since the news of them fast-tracking Daredevil Season 2, obviously I don't still think that. I do think we'll see Luke Cage in late 2016 (October/November?), especially following Luke's introduction in Jessica Jones later this year.
I think it'll work out like this:
Jessica Jones (Fall, 2015)
Daredevil - Season 2 (Spring, 2016)
Luke Cage (Fall, 2016)
Daredevil - Season 3 (Spring, 2017)
Iron Fist (Fall, 2017)
The Defenders (likely Spring or Fall 2018).
I know they said Defenders was originally slated for 2017, but I seriously doubt they'll make that with Luke Cage not even having started filming yet (though obviously filming soon) and Iron Fist not even cast yet. Plus, as said, Netflix is aiming at releasing one every six months, so that's two per year.
Obviously there's a huge potential for further spin-offs/expansions like a Punisher series (very likely after his intro in DD Season 2), Elektra, etc... and those are only potential spin offs of characters introduced in DD.
And of course there's always a likely possibility some of those characters will transition to the MCU film (likely in their own films, like a Daredevil or Jessica Jones or Punisher or Heroes for Hire film).
But yeah, check the date on that first post. That was almost 5 months ago.