Baseball definitely has passionate fans, and it's still somewhat popular, but it has really struggled to adjust to the times. It's still pretty popular among white men over 40 though.
My nephew is 12 and he loves it so some young folx still play it. My son is 2 and watched Sandlot with his sister and now practices his swing and throwing constantly. We got him a tee and he takes about 75-100 swings a day on it with absolutely no encouragement from me. He should focus on football.