Its our pastime because of TV ratings, tailgating, and the fact baseball isn't our pastime anymore.
Not a chance. Football (Americano) is not Boxing. The nature of boxing causes concussions. Football can be changed to make it less dangerous. The reason we have helmets at all is because of an effort to make football less dangerous. The same is true of the forward pass. America will change football before it replaces it with Soccer- a sport that doesn't lend itself to American needs for instant gratification and demosnstrations of physical strength.
Honestly, flag football doesn't actually sound that bad. Tackling itself could be prohibited, but blocking and other types of roughousing allowed. Multiple flags could be placed on the player, perhaps the back, shoulders, and waistline. The flags could be difficult to remove so that some level of strength is required to remove them. If a player succesfully removes two flags from the ball carrier, the ball would be placed at that spot and the down would turnover.
Football may have to change, but it sure as hell isn't going to be replaced by soccer- unless soccer itself changes. Frankly, the idea is laughable to me as a person who played soccer breifly in a California highschool, where the sport should be the most popular. Even in California, soccer games were mostly attended by friends and family, while much of the entire highschool aparatus was designed around football (band, cheer, homecoming, ect.). And, while I lived a couple years in California, I've spent most of my time in Georgia and Alabama. It would be unimaginable for soccer to replace football here.
Unfathomable. I don't want to be dismissive, but I feel even the suggestion that soccer might replace football here in the southern United States just reflects an inexperice with this entire part of the country (let alone "don't mess with my multi-million dollar highschool football stadium" Texas). Such a suggestion just wouldn't even compute with your run of the mill southerner. A large part of our culture is pretty much organized around it.