At the Smithsonian site, Joseph Stromberg interviews Dave Zirin, author of the new book, Game Over: How Politics Has Turned the Sports World Upside Down. The two discuss the biggest changes in sports in the past five years, including the impact of concussions on the NFL. An excerpt:

“Question:

The other day, Baltimore Ravens safety Bernard Pollard said he doesn’t think the NFL will exist in 30 years due to these sorts of problems. What do you see happening?

Dave Zirin:

I disagree with Bernard Pollard—I don’t think the game will be appreciably different than it is now. But I think it will be less popular, the same way that boxing is much less popular today. Fifty years ago, if you were the heavyweight champ, you were the most famous athlete in the United States. Now, I bet the overwhelming majority of sports fans couldn’t name who the champion is. It’s just not as popular.

So I think it’ll be less popular, and I also think that the talent pool is going to shrink as more parents keep their kids out of playing. You’ll see the NFL invest millions of dollars in urban infrastructure and youth football leagues, and it’s going to be the poorest kids playing football as a ticket out of poverty. This year, the four best young quarterbacks—Andrew Luck, RGIII, Russell Wilson, and Colin Kaepernick—all four of them excelled at multiple sports and came from stable, middle-class homes. Those are exactly the kind of players who won’t be playing football in 30 years.”