IDK that crazy is the right word. It actually happens all the time.
For example, San Jose State’s on-campus football stadium is only 5 miles from the San Jose Earthquakes PayPal Park. Real Salt Lake’s America First Field is 15 miles from the University of Utah’s near 52,000 capacity Rice-Eccles stadium. Countless examples just like that can also be cited.
Furthermore, you don’t often, if ever, see professional teams sharing stadiums on college campuses. If anything, it’s usually the other way around — such as University of Miami’s football team sharing Hard Rock Stadium with the Dolphins.
I realize that Sac Republic isn’t MLS, but they hope to be one day. While most things are possible, it just seems unorthodox for the potential MLS team to not have their own stadium. When you add the fact that city of Sacramento still badly wants to develop the railyards, losing the potential catalyst of a soccer stadium could really hurt that effort.
I could more so see Sac State’s new sports stadium being a temporary thing for the Republic until they get their own facility built. But their initial involvement/commitment would still help.