I saw an article stating that the stats predict the starters will go 75-40. Suppose (conservatively) that the Phils hold a 25-22 record in the remaining games where the bullpen earns a W/L, and it's hard to imagine a scenario where the Phils win less than 100 games. Barring injury, of course.
It'd be shocking if the Phils don't win 100, don't romp in the NL East, and struggle at all. Even if they lose just one of that Front Four.
75 games seems about right from the starters. If they have a competent closer, they won't need to score any more than 4 runs per game.