The ultimate (impossible ?) NFL alternative timeline.

In honor of the big game today..... and of Calvin Johnson getting into the hall of fame. I have a question about an alternative history.
At what point (if any) after say 1975 and with what POD would it be possible (if it is) to get the Detroit Lions into the Super Bowl as something other then spectators?
One requirement, the owners have to stay and they have to stay in Detriot. But hands off ownership is an option.
 
Top