Where are you going to expand LaBahn?
Bounded to the north by The Nick; bounded to the east by the Kohl Center and the Nicolas-Johnson practice building; bounded to the west by part of what's known as the East Campus Mall; bounded to the south by access to the KC "loading dock", the city's bike path, and then relatively newly built hotel, etc to the south of the bike path.
The KC was just recently 'expanded' to add student-athlete service stuff, like "academics, a student-athlete hub, sports nutrition, strength and conditioning, sports medicine, and administrative functions", built over the top of the loading dock to the southwest of what one would normally think of 'the Kohl Center'; if locker rooms were going to be part of that, they'd already be done, and available.
The only space conceivable is to the west, 'interrupting' East Campus Mall. And it may sound silly that that would be an issue, but 20-25 years ago, UW went to great lengths to create the East Campus Mall, with the idea being a north-south mall as a complement to the east-west 'mall' that is State Street and the Library Mall; a pedestrian walkway that stretches from the south edge of 'campus' to the Union and the lake. In creating the mall, they tore down at least two buildings; the old Ogg Residence towers, and a smaller administration building (if it had a 'name', I don't remember it). So, it would be a bigger deal than one might otherwise think to reverse the thinking on East Campus Mall.
That means going 'up', or going 'down'. Both really expensive options.
I'm highly skeptical.