If this becomes a common trend in American Football it could cause the game to evolve back towards Rugby Football. A good example of how fast rugby is played is this game: http://www.youtube.com/watch?v=g7ZU4GKmOoQ
Particularly at 3:15 where the ref gives a player a yellow card for slowing down the game. (Note that this isn't just a minor game, its an International Test between the worlds two top ranked teams).
As an Aussie brought up on Rugby, this is the thing which most gets in the way of me enjoying US football - its so stop/go! They seem to only play for about half a second, then they stop - there doesn't seem to be any flow. I keep on wanting to yell 'Get on with it!'
The best description I've ever ever seen of American football (can't remember where I read it) was 'random violence interspersed with committee meetings.'
Particularly at 3:15 where the ref gives a player a yellow card for slowing down the game. (Note that this isn't just a minor game, its an International Test between the worlds two top ranked teams).