I am shocked he has to put his own money into this movie. It must be really off the wall for a studio to not invest in that. Studios are generally willing to raise money for movies by big name directors even if they haven't had a hit recently (see how Terrence Malick keeps getting to make big expensive movies, most with a-list stars despite not having had a commercial or widespread critical hit since the late-90s).
I then made the horrible mistake of watching Godfather 3, which basically seemed to have 90s romantic comedy vibe with Al Pacino not playing Michael Coreleone but simply playing Al Pacino. What then surprised me even more was that the film received pretty favorable reviews at the time. Wow how we can be blinded in the moment!
I would very much hope that Mr. Coppola achieves something grand, especially in the current era of horrible movies, but color me skeptical based upon his later work. I could understand if executives are wary as well.
On a side note, since you mentioned him, Mallick’s recent A Hidden Life is an absolute masterpiece. It may be my favorite movie (need time for it to sink in). But what a powerful depiction of conscience & struggle. One thing I often wonder about: who is the main character, the man or his wife? Whose Hidden Life is really the subject of the movie?