Scottsdale has bigger fish to fry than hosting a very small event like Surf. If there is even a whisper (there may have already been, we'll see) that having Surf will trigger restrictions, Scottsdale will pull their fields. There are way too many events in JAN and FEB that drive a significant amount of revenue for the city.
Scottsdale tends to be a pragmatic, business friendly and savvy city. In my opinion, they won't pull fields because of "science", they'll pull fields because of economics. They prefer having lear jets flying in daily to attend Barret Jackson and the Phoenix Open vs hosting families in suburbans and minivans who are ordering takeout from chain restaurants and cramming 4 people into a room. The dollars don't add up.
Scottsdale will hold off on making a decision until they get a better lay of the land from the county and state.