I like your analogy (and impressed you do those races), but where it falls down is that the net may be secured at the beginning of the race, but what happens after half the competitors mangle the net? Do the race administrators stop the race after each contestant scales the net to inspect, re-secure it, and then let the next competitor up? No, the competitors at the end of the race have a higher risk of failure of a piece of equipment than those at the head of the race, and, as a result, slower runners have a higher risk of injury than faster racers.
I have no doubt Disney is going to have every single room, ride, attraction scrubbed and sterilized to within an inch of its life...for the first round of guests after they first open; it's the second, and subsequent rounds, of guests who will have exponentially greater risk of contracting anything. Unless, of course, Disney decides to do a rolling closure of resorts, and attractions, to sterilize them every week or two, for the rest of the life of their operations.