Most people are already conditioned to do this. At a hotel- any hotel- and we hear a knock and someone says “Housekeeping” or “Security” or “Maintenance” and we open the door.
Some people are more cautious than others, but many just open the door.
A couple of weeks ago at Beach Club a housekeeper came in to check the room for the scheduled power outage that was going to happen at 11 am. She knocked and announced herself. I opened the door. She completed something in her checklist and left. Things like this happen all the time.
The biggest concern I have about the new checks is leaving my child in the room. I’ve left my eleven year old in the room while I went to get drinks in the food court and I’ve told her not to open the door for anyone. It would be pretty scary for her to have someone walk in on her while she was in the room by herself. Of course, if we have scheduled housekeeping, then supposedly that wouldn’t happen.