There are warnings about how the concussion problem will put an end to the NFL in about 20 years. However, there are more colleges playing football than ever before. The placing of a permanent team in London is a big mistake. Canada might be a better choise. Yet not really. 32 teams right now. To achieve balance there would need to be 2 more.
Or change the rules in football. Get rid of the helmet. Minimize the equipment. Max weight = 250 pounds.