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You're wrong that we can't imagine future controversies. Heck, there's an entire genre based on imagining the future. Just off the top of my head, I can imagine:
Artificial eyes
Cat gene treatments
Mormon team owners
Robot umpires
Elbow replacement surgery
Cyborgs
Telepathic signals broadcast into the heads of visiting players
Sure, none of these might happen, and the only controversy will involve teams that go to 3 infielders & naked ballgirls dancing between innings, but that's been imagined too.
Mostly, though, I imagine that baseball will continue to decline as fewer & fewer boys have the time, space, or inclination to play the game.