A big part of why rivalries aren't what they used to be is due to reallignment which took natural and historical rivals out of each other's crosshairs. Remember when the St. Louis Cardinals, Dallas, Washington, New York Giants and Philly were the NFC East? Cardinals shipped out to Arizona and took some historical vitriol along with them. The division hasn't been the same since.

How about the Falcons, Rams, Niners and Stains being the short-handed NFC West? Rams and Niners still hate each other and Stains and Falcons really can't stand each other to this day, but Carolina and Tompa Boo aren't on the same level as the old days. How in the world would anybody expect Indianapolis to form a serious rivalry with Houston, Tennessee and Jacksonville? They're barely in the same country.

The closest thing to the old rivalries is the AFC North, NFC North and AFC East. They all have original divisional teams in them and coincidentally, they all have original franchise hate when they play each other.