I am very surprised at what seems to be, at least so far, minimal roster damage due to players choosing to opt out of this season. In the WNBA quite a few players opted out, yet in the NCAA relatively few among over 350 teams.
Maybe that is because someone sitting out from a non-elite program is not a newsworthy event, and there have been far more than we know about. I'm sure the schools and conferences have a wide variety of practices and restrictions but the difference seems stark.
Some of the pro players chose to spend their time fighting for social justice causes. Some sat out because of health issues or concerns, and I'm sure many just simply did not want to live in the very restricted environment of the "wubble". That was very hard for the players and their families, but in terms of the virus it worked very well.
If anything even vaguely similar happened at the college level many of the top programs would be impacted. Also it is harder for colleges to fill in the holes. Unlike the WNBA they can't just sign the best available free agent.
This hasn't been a big issue yet but at UCLA they had two players opt out, and two more from Australia can't travel here yet, so they are left with 8 practice players. Maybe more walkons in the rotation.
Since this is not an actual bubble, in addition to the usual attrition from injuries, a few opt outs, and some expected positive test cases down the road, the tail end of the bench may have far more significance than usual and a few teams could be devestated.