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Allen apparently turned down a new 4-year, 1 million dollar deal, and then was dismissed.
An addendum to this: If Allen would have accepted this deal (I am guessing it was in early 1978), history would have been different. The Rams were on the verge of making Walsh their HC when Allen was let go in Washington.
Despite poor recommendations from GM Don Klosterman (as well as Carroll's son), Carroll Rosenbloom hired Allen over Walsh because he beat Dallas, and that's what he liked about him. It may have been the biggest mistake in Rams history.
Aside from any "could've, should've"s about the Packers, here are the ones I'd love to have seen...
1987 NFC Championship Game - #4 New Orleans Saints (12-3) at #1 San Francisco 49ers (13-2)
The best two teams in the league in 1987 both got knocked out by an 8-7 Minnesota team. That would have been a heck of a showdown. Imagine either New Orleans winning its first Super Bowl or San Francisco winning three Super Bowls in a row.
1994 Super Bowl XXIX - San Francisco vs. Pittsburgh
The two #1 seeds and the battle to be the first team with five Super Bowl wins.
1985 Super Bowl XX - Chicago vs. Miami
A very common one, I'm sure.
1986 Super Bowl XXI - Giants vs. Jets
If the Jets stay healthy, this could have actually happened.
1990 Super Bowl XXV - San Francisco vs. Buffalo
"There will be no three-peat!"