Evolution affects everything including sports. Remember when dunks were not allowed and steroids were not technically illegal in baseball? How about the three point line in the NBA and football was played with leather helmets. Sports are like everything else in life, they change with the times. Although change is not always welcomed and many people fear it, most of the time through change the product becomes better.
For generations fighting in the sport of hockey has been a hot topic of discussion when it comes the sport evolving. More than any of the four major sports, hockey has seen more change since its inception in the early 19th century. Remember when goalies used not to wear masks? How about the two line pass? The sport of hockey has not only seen the most change since its inception, but even today constantly embraces new ideas to improve the game.
If the NHL wanted to rid itself of fighting much like the regular season ties, it would be making a huge mistake.