Is college football still a thing? What's the status of the Church (and of religion in general) as America becomes more secular? What about global politics and economic factors? Is America still the only superpower? How have things like self driving cars or mass transit impacted Utah and the nation? What about higher education? How will it change in 50 years to include more online offerings?
So many factors that have to be answered before we can ask how that population impacts BYU sports.