If nothing else you got your message, as a long term DVC owner, that you are not happy with this new policy and procedure. The louder message would be to sell and tell them why. I just wonder; does it state anywhere in your contract with them what their uninvited entry rules are, and are they in compliance. Is there anything you can do via your DVC ownership?
I had/have my next three trips booked offsite, letting them know why. That means not only my daily room rate, but the money I spend at the food court, now my parking money and more dining will happen offsite rather than on property. My last stay (Easter) at offsite hotel was with a legit DND sign, a paper in my suite telling me to use it and they won't come in ... and a much nicer stay than my last at Disney. (no Disney, it's not industry standard)
I will just say I don't think this has anything to do with Las Vegas (most Disney rooms offer nothing like that kind of vantage point) and rather to do with another situation that has Disney the focus of some investigations. Sadly I think rather than invest in a long term security procedure - we got ........... this.
So likely your solutions won't help.