At the risk of sounding petulant, I have a thought that won't go away after watching the end of the Lions game. In this league of protecting the QB at all costs, where is the sportsmanship shown by Matt Stafford at the end? My view is, the Cowboys D heard spike and were going to allow it without going hard as a courtesy to the other team. No reason anyone should be hurt on a throwaway play like a spike, much like Tampa diving into the line on a kneel down, it's just not done in that situation.
To put it another way, what would have happened if Sean Lee dived over the line Troy Polamalu style and creamed Stafford as he executed the spike? Short answer:big fine, possible suspension, label as a dirty player. Instead the D does the time honored thing and allows the throwaway play. Stafford takes advantage of this courtesy, and the tone of the league as a whole, and jumps in for the gimme score. Cheap shot is all I could think.
To be fair, nothing illegal in what happened, just not the accepted practice. Dan Marino had a great fake spike against the Jets years ago, and I have no problem with that one. This is a different league, Dan could have been creamed on that play and no fines or penalties assessed.
My final thought is, if you as a league are going to have rules that favor the QB so much, then some concessions to the D may be in order. Don't tell them to be easy on the QB and then allow their class to be their undoing.