Like all Jazz, it kept mutating. You can hear it in modern Jazz to this day. Is there a Bill Frisell or a John Zorn, without Fusion. Don't think so.
You always have the decision to add something new to your past or go back. Just because you move forward does not mean you discard the past, but like I said a long time ago, once you stop moving forward and learning the new vocabulary, everything new will sound odd, out of place, except the vocabulary you know and you are stuck in the past. The decision is always yours to make. Both as usual have consequences.