It peaked some time ago, before protests and cte. Viewership, that is. Financial growth is largely horizontal and not based on growing viewership. I am interested to see what TV offers in the next contracts, ESPN/ABC in particular. Cord cutting and general resistance to increased fees from ESPN by cable companies is a hot topic right now.
This is not restricted to the NFL. NASCAR is down something like 40% from its peak viewership and attendance has plunged so much that grandstands are eliminating seating. MLB viewing is down. Don't know if the NBA, NHL or college football is up or down, but based on anecdotal info, enthusiasm for all of these are way down.