Political parties will always resist the disempowering of the party, and things like runoffs, preferential and range voting, etc. gives more choice to the voter and fragments parties. It fragments them because the voter isn't punished as often for taking a chance on what are otherwise considered fringe candidates.

The U.S. is one of the older representative democracies now with the oldest written constitution, which is also difficult to change. Making elections more modern, fair, and actually representative will take a lot of effort by citizens.

If SCOTUS finds in favor of existing extreme gerrymandering practices in the Gill v Whitford case, it will be necessary for citizens to actively crack the grip of the two incumbent political parties, or accept generation long single party rule disconnected from representation of the citizenry. Gill v Whitford is the easier path, but modern elections still need to be a goal: city, state and federal. It will take time.