How can the studio salvage this saga?
Part II has already been made, and money was already spent. They have to release it: I think they made the right choice by delaying its release. Let this movie get some viewership on streaming and hope Part II works out
But after Part II, I think they have two options
1). Cut Part 4 off entirely and force Costner to condense the two movies into Part 3, which will be the conclusion. The downside is the negative press when people realize they cancelled Part 4 because of this movie’s failure
2). Severely limit the budget for Parts 3 and 4. The downside is that the movie’s strong points are the costumes and cinematography; can this sort of movie survive without breathtaking shots of open western scenery?