After some consideration with the wife, we aren't going on that trip to Utah I mentioned earlier. I think we could do a lot to mitigate some of the risks, but the reality is the plane ride is just too much, plus we have no idea how crowded certain places will be and won't have a lot of choices if they are.
Probably going to rent a house or cabin on the water for that week instead (probably Wisconsin or Michigan), stay mostly in the house except going out to canoe, fish, swim, hike, bike, etc. Get groceries, pick up food, maybe eat out just a few times when it's outside dining. Way less risk, still a week of fun for the kiddies and some time to relax. Also likely a much cheaper trip, so bonus there.
Still really want to do Zion, Bryce, etc., they will just have to wait.