What does the price of a US pro sports team have to with chronic post football health issues?
Billionaires lust to own a major sports team because it's a very lucrative (well, NFL/NBA for sure), extremely exclusive, high profile, extremely enjoyable way to invest your money--paying huge dividends and offering massive ROI.
It really doesn't matter how many kids are playing Pop Warner---nearly all of them are not future NFL talent. Those who are will always continue playing through HS, desperate to get a scholarship. Of those, the best will be in the NFL.
We've been hearing for quite some time that CTE, etc would be the death knell for the NFL. All evidence points to this not being the case. Anecdotal tough luck stories of outliers does not change this.