This is an RPGM Game with static images. He already has received the images for chapter 5. It's not like he has to stop all of his programming, writing work while two of his artists had injuries. I'm just saying if he really wanted to release chapter 5, it could have been done. Just face the facts.
If I understand correctly, Zion wanted to branch out to side projects (Eden Crest) and diverted time into that. I is not what we want and it is not as good as Succubus Covenant or Warlock Saga in my opinion, but it is understandable. I don't agree with the decision to divert time and resources from the main series like
Zion of Olympus did, but I get it. It's very easy to burn out doing the same thing and pretty normal to want to explore other avenues or hit a writers block and such. Been there.
Thus, I believe that this delay is not abandonment of the game or intentional long-term money milking like we've seen in many projects. I would venture a guess that the delay is caused by diverting resources and possibly burnout, but the game will come. Sure, it sucks that it is delayed, but I am rather confident that Zion will deliver... eventually.