Twitter, Facebook so much about the Landscape of Online Sports/Gambling Discussion has changed since the time of those Number of Users Online. Politics getting mixed into NFL, Difficulties with Online Sportsbooks...maybe you're even going back as far in time to when US Bettors could use Pinnacle & BetCris....
No one is gonna wanna hear this probably but I believe also that problems arising from Concussions (CTE) in NFL have turned some people off from the game. When Junior Seau took his life that was a Hard Wake Up Call, to some people.
Covers = So Many and quite alot of the discussion threads turn into fights. That doesn't happen here as much, thankfully.