Its losing it's replayability now that the NFL has been increasingly using RPO's, and more advanced play calling. I think NFL Head Coach 09 is probably near it's death due to old age, we need some of it's best assets in Madden at this point.
Suprisingly, EA has recently used things from it. Madden 19 had all the camera angles that HC09 had, the on field AI improvements, in season scouting, etc.