Despite its earning critical goodwill, especially in comparison to its predecessors, Terminator: Dark Fate will likely go down in history as a potentially franchise-killing box office bomb. How does its director, Tim Miller (Deadpool), feel about that? In an unprecedentedly candid interview with Los Angeles radio station KCRW, Miller got into his feelings about the whole affair -- and spoke about his difficulties working with Terminator creator James Cameron and Deadpool star Ryan Reynolds, too. "I'm sure we could write a book on why it didn't work," mused Miller on Dark Fate's financial failure. "I'm still …