Talent alone is not enough
Cameron made The Abyss, passion project that is plagued by production problems .Even though the CGI is ground breaking, the 2 leads put up a very strong performances, and the action is still Cameron at his best, but the movie suffers from a rather bland, preachy, anti-climactic 3rd act.
Michael Mann did Blackhat. This is the guy who did Heat, Collateral, Miami Vice Series, Manhunter, Last of the Mohicans, Insider. What could go wrong?
Some people are just semi-retired. And they probably took some project for mind exercise or to keep themselves busy.
Scorsese never made a boring movie. But his last few ones: Gangs of New York, Aviator, Wolf of Wall St, and especially Departed, do not contain his passion for filmmaking he showed in Goodfellas, Raging Bull or Taxi Driver.
Who runs Skydance again? Viacom which owns Paramount has a new CEO, a lawyer, since 2006 when Sumner Redstone stepped down.