You sound like my grandpa who was dead set that free agency would kill baseball.
It kinda did for me. I grew up in the '50s in Central Il and every kid had favorite team, mostly Cardinals or Cubs. A few White Sox fans and sprinkling of Reds and Yankee fans. But every kid was an avid fan of some team. I listened to Cardinals baseball day games on the radio in high school... through a single earpiece plugged into a radio hidden in a holloed out book. Early on Stan Musial was the man, then later it became Bob Gibson, Bill White and Ken Boyer, Ozzie, et al. Up until the 70's I followed the Cardinals because you knew the guys were going to be back every year. Then came free agency and rosters became more like a Chinese fire drill every year. I haven't listened to a Cardinal game in decades. Don't even bother to check the standings or their play-off odds.
I doubt kids in that little league age group have anywhere near the devotion to baseball that we had in the 50's.
But I still had Illini Basketball. I loved getting the scoop on new recruits every year and speculating how those freshmen were gonna develop over the next few years. Sure, college only allows four years (sometimes 5) of eligibility but there was consistency.
I don't think wholesale annual roster turnover will dampen my devotion, but most of my youth I expected to be an avid Cardinal fan for life.