Their point of origin is not the same as their final destination. So logistically, this makes sense. Given all the different requests the Band receives from Athletics (Victory Walk, Tailgate Bands, etc.) in addition to the plaza show, 20-minute pregame show, and morning rehearsal - the band would not be able to fit a parade down University AND find time for a 15 minute break before a 20-minute pregame to hydrate, let alone find time to put their uniforms on.
Victory Walk is asked for by the football team and runs on their time (sometimes they show up 20 minutes early). Busing the band to one end of University is not cost effective as it costs somewhere around $5K alone just to transport the football team from Bierman to the loading docks of Mariucci. Too many variables on campus have changed over the years (mostly due to Memorial Stadium being torn down) to the point where a parade down University no longer makes sense. If Memorial Stadium still stood, and the band still lived in Northrop - then this tradition would most likely continue to live on. Would it look a little different now than it did then? Of course.
TCF is a new chapter for the U and it's alums. Let it evolve into a new experience that you and your children will cherish for the rest of time. Stop living in the past as this is more of an apples to oranges comparison. We are only 4 years into this thing, and traditions take time to establish themselves. There is no doubt the band will be making minor changes to how things work prior to kickoff for years to come. heck they are still pushing to get the Plaza Show on the actual Plaza vs. on the street.