local AP's can go to the park just like they can right now. Except they would be limited to one park a day and no extended hours. (really that's no different then what they are getting now)>
The CMs and guard would be the same as the NBA CM's that go home each day but are tested upon reentry to the bubble. (Personally I would prefer that they live in the bubble, but that's just me).
If you forgot an essential then you can buy it overprices at the resort store, or have the Mickey delivery service deliver it to your hotel door or to the parks guest relations.
Each Disney park has a medical center in the park (I've seen the one at AK). So they would take care of it. If it was more urgent than that they would be transported to the hospital (but in that case they probably would not be going to the parks for the forseeable future anyway).
Attendance would be fine. Those not staying at the resorts would have the same deal they have now. But if you stay at the resorts you have the incentive of park hopping and extended hours. (a resort person can opt out of that and just have normal hours and no park hopping. That option is always there)