The rules have changed to favor quarterbacks and receivers, making running the ball less important.
Rookie running backs are just as productive as veterans, and they're much cheaper.
The shelf life of running backs is relatively short, making them a risky investment.
The NFL is moving towards a more pass-heavy league, which will further reduce the value of running backs.
Ezekiel Elliott's second contract is a cautionary tale for teams that are considering paying big money for a running back.
The Chiefs' success with Isiah Pacheco shows that you don't need to spend a lot of money on a running back to be successful.
The market for running backs is likely to continue to decline in the years to come.
This could lead to more teams using a committee approach at running back.
It could also lead to more teams drafting running backs in the later rounds of the draft.
The decline of the running back position is a sign of the changing times in the NFL.