For the average American (Even that "runs"), pro track is not very relatable. Road Running marathons or something "extreme" like ultramarathons or Ironmans are more relatable or interesting.
Besides kids in school, the average (adult) American runner does not do 5ks on a track so they can't relate to that. A cross country "park run 5km" or a Warrior Dash/Obstacle race is more entertaining and something they can experience. They may run road marathons though...so at least Kipchoge going for a "sub 2" is somewhat more inspiring and worth watching and talking about.
But running in general also doesn't have the same "dynamic action" that sports like Football or basketball or even soccer have. Things constantly change with ball sports and to the average American that is exciting. It might not be "relatable", but most of us have probably played some pick-up basketball or football games or soccer games (even if we never played in school and could never be close to an NFL or NBA or MLB or FIFA athlete). So it's seen as entertainment and that is "fun."
Another thing: Distance running is hard and painful. People don't always like to relate to that. It's nicer to relate to more comfortable and fun sports like golf and skiing too 🤣. Why tap into that feeling of high lactate levels or glycogen depletion when watching others suffer in distance running?!
Okay, I gotta get back to watching the Super Bowl ads (the only reason I'm watching "the game" really)...I don't care about other "pro sports" besides running (but I'm not like the average American in any way really).