I hate to burst your delicate little snow-globe, but gamers that also follow sports are not the preciously unique snowflakes that our mothers told us that we were.
In my experience I would say that it might be a slightly smaller percentage than average people, but not by too much. Most gamers I talk to can also talk a good game about sports. There are also things in common between gamers and people that play fantasy sports, and I know plenty of people that do both.
I think you may be the in the snowglobe. I have very many sports friends and very many gamer friends. Those two groups only share one person and that one person is me. I played last night and no one was wondering where Kyle Lowry would go, whether Sid came back too soon, or laughing maniacally at the bears (mitch trubisky?!?!?!? Really??? Oh god I love it go pack go)
To answer the OPs question though, yeah, barb, ranger, and fighter all clearly fight for some of the same space. Of the three I see fighters the fewest by far at tables. I think they come with the least amount of built in thematic material to conceive around.
I think druid full casting gimps wildshape, and I think wildshape gimps full casting. Let's split those two up. Shaman and Druid?
Sorcerer can do cool things, but a lot of times I think it just ends up feeling and reading like a less good wizard. I think they also go a long time between getting new and exclusive toys to play with.