One of the biggest developments for pro football in 2017 might not have to do with virtual reality, live streaming NFL matches, remote-controlled tackling dummies or sideline video on tablets. But it could advance the use of those innovations in the NFL.

It's called a developmental, or "D" league which could provide a steady-flow of pro-ready players, coaches, officials and more, along with employment for countless NFL wannabes that didn't make team or practice squad rosters or capture the attention of the 32 franchises at all.

Read More.