30 years ago, nobody would've envisioned the decline of boxing and baseball. However, with the rise of the NBA and ultimate fighting, you're seeing those two sports dropping down to U.S. Soccer-level status in this country.
I think football CAN be saved. However, like in 1905 when Teddy Roosevelt got colleges together to save football back then, there needs to be some major rules and equipment changes:
-Soft-shell helmets. The hard shell helmets that have been in football for 60 years have caused the bulk of head and neck injuries because they become a weapon.
-eliminating facemasks. Look at old football films. Most of the tackling is done either by the shoulders or by throwing the runner down. Facemasks make people crazy-brave. You run into people and attack folks that, out of uniform and on the streets, you'd be terrified of walking with down the same street. You eliminate the facemask, people risk broken noses and busted teeth, instead of spinal-cord injuries and brain damage.