I can see that but I think that was the Suns choosing Bender over Chriss. If we throw away Bender right now, it says that whole draft was a complete bust, which is likely anyway. That makes McD look really bad. We drafted Bender, fine, but paid a premium for Chriss and then decided after 2 years both are awful and we're cutting them loose. That is firable, IMO. Admitting that is enough to throw his job in jeopardy and perhaps that's the way things should go. Its a weird time for it but its inexcusable to bust on the draft like that and throw in the towel 2 years later, after repeating similar moves this year and hoping people buy it this time for some reason.
See, I don't think McD or Sarver care about a bad draft as much as we think they do. We can argue over luck, other players being common sense picks where they were drafted, but getting Booker, even Warren, Jackson, and Ayton is more important than missing on Len, Bender, Chriss. Suns need a point guard, but they will start winning at some point, Booker is gonna look like a top-ten player in the league, Ayton is going to look very impressive too, Jackson is gonna keep improving, and nobody is going to give a crap about missing on two top-ten picks in one draft.
EDIT:
To add and clarify, I am NOT necessarily in favor of declining the option and giving up on Bender just yet.