For example, maybe they could adopt something like ultimate frisbee rules? A receiver is marked down at the spot where a catch is made. Eliminate running backs

For example, maybe they could adopt something like ultimate frisbee rules? A receiver is marked down at the spot where a catch is made. Eliminate running backs and tackling from the game entirely. Defenders can try to jockey for position to intercept the ball or deflect passes (but still can result in pass interference), or they can rush the quarterback from the line of scrimmage, where pass blocking operates mostly unchanged from how it is today. Perhaps tackling the quarterback (with continued improvements on protecting a defenseless QB) is the only place where tackling is still allowed. This would get rid of about 99% of the situations where there are violent, high-speed collisions, and where tacklers coming from the linebacker or safety positions end up involving the head in violent tackles. The obvious downside is that it eliminates rushing or yards-after-catch from receivers, especially long, wide-open touchdown sprints. But I don’t see how open field running and tackling can possibly coexist with concussion safety in the future of the sport. There will be some type of huge reckoning I think.