But AFAIC, given the problems American football has (it is, after all, the bastard child of rugby and soccer), there's probably not much of a market for it, outside of Canada (and they have their own league and rules) and a few other countries.

Problems include: the CTE injury issues, the number of players needed, the inherent anti-democratic nature of the game in terms of opportunity and participation (in contrast to other team sports). . .etc.