Utah added men's lax and seemed to draw more like 1,400 or so per game in their first year, and more like 2,200 before Covid knocked their season out last year. Their debut game had 3,200. They aren't particularly good, which is to be expected as a new program. My sense is that Colorado is a little bit more of a lacrosse state than Utah...
With Air Force, DU and Utah there is a small nucleus of teams to play without massive travel, which might grow with time. Still, Utah's schedule is chock full of wacky teams and long distance travel.
College baseball also relies on proximate non-conference teams to fill out schedules with mid-week game in addition to weekend series. CU would have a hard time there as well, as UNC and AFA are the only D1 baseball teams around.
I'd rather seem them add men's lax, since Colorado is something of a hotbed and it would generate good interest, in my opinion. I'm biased since I played club lacrosse in college... but I think it could be very successful and popular.