While this franchise is starting to feel a bit long in the tooth, such details suggest that screenwriter Derek Kolstad (here sharing credit with three other scribes) can still mine this world for plenty of new life, so long as future installments find a way to deepen the John Wick mythos instead of just stretching it out. With the significant exception of “Mission: Impossible,” this is easily the best action franchise Hollywood has going these days, and it would be great for it to keep going with renewed focus.