What's interesting is the Netflix release said Iron Fist (the character) isn't going away, so my guess is they consolidate him into one of the other Marvel shows.
I'm sure they'll make a Heroes for Hire and/or Daughters of the Dragon series. It just sucks we won't get to see the rest of the Immortal Weapons, the rest of Ward's story, etc...
Trend? Punisher was good. JJ was predictably worse because it didn't have Kilgrave to carry it. Luke Cage was always pandering garbage, and Iron Fist improved from S1->S2.
Daredevil's always been best of the bunch, so it's kind of weird Luke Cage and Iron Fist both had 2 seasons between since the last season of Daredevil