the teams,even the great ones from the 70s, would need to have similar training and diet methods as modern teams for the 60 and 70s teams to have a chance on the field
the lenience in the rules back then would make the physical monsters of today even more nightmarish against the players back then..
it is said that the game is won by the O and D lines(it certainly helps to have good receivers,qbs,etc. though)...and the modern size,talent,training would be a significant advantage on both the O line and the D line
anyway the main point is that these particular changes in rules(or atleast the majority..pointing out one rule as an exception doesnt completely counter the main argument) that make the NFL the "no fun league" are very important to prevent injuries that cause serious and long lasting damage..
the point is not to eliminate injuries altogether either(again,its nearly impossible to with the way football is played and the stature of players today)..but try to eliminate or significantly decrease ones that have the most detrimental effects, specifically the brain
i dont understand how this is particularly "pussy" football either...i still see a crapload of hard hits,sack....football may be a little less extreme than it used to be...but i dont see how the basic structure and tackling aspect of the game has been altered because of recent rules
part of what makes up this,in your perception, "pussy" league is the continually evolving change in the players and the game overall..as in right now QBs,offenses,etc. have slightly the upperhand...you can argue it has to do a bit with the rules, and surely thats part of it..but you have to understand that there will be continual advancements in technology,changes in defensive structure and idealogy, etc. which will cause shifts in "football power"...