Make no mistake, these guys get compensated very well for what they do.
HS kids get nothing, College kids get a scholly and whatever they get under the table. Even NFL players for the most part don't get much considering most of them only play a couple of years. And even the ones who do make out well...is it worth lifelong disability? These are the questions that are starting to be asked. If enough Mamas won't let enough Johnnys start playing football in middle school, there goes the talent base in ten years.
Boxing was once huge, it's now a somewhat disreputable niche sport populated by foreigners and people who can't make a living any other way. If football doesn't make radical changes, that's its future. And I don't know what kind of radical changes could be made that would 1: change things and 2: keep the kind of audience it has now.