the NFL right now is like the nightmare worst-case scenarios that people were dreaming up in the 90s when they first started talking about implementing instant replay. The games take forever, the calls are still wrong half the time, and there's barely any flow to the games. If they had let the play finish, the Lions get 6 on the board and it's automatically reviewed (and then probably upheld). Now the Lions don't get the ball, have to use one of their limited challenges, and then won't be able to score after getting the turnover they deserved.
In 20 years the NFL is going to have 4 second plays with no contact and then cut away to a bunch of guys in New York flipping through rulebooks and doing frame-by-frame analysis to decide on what happened. It'll be like a tabletop rpg or strat-o-matic played by lawyers.