There are different types of rivalries in the NFL.
We call the Green Bay Packers-Chicago Bears a rivalry, same with the Minnesota Vikings and Packers. They’re timeless, because the proximity of the teams means the people in those states live the rivalry year round. It doesn’t matter which players are in the respective uniforms. There are also rivalries like the San Francisco 49ers-Dallas Cowboys in the 1990s, with two teams hitting their peak at the right time. Those teams produced great games back then, but if they were playing tomorrow you probably wouldn’t bother to watch.
The Pittsburgh Steelers-Baltimore Ravens rivalry fits both categories.