You are Op of this thread. have you tried to use this on a smaller scale? if not
Then go ahead and try to convince your neighbor first. if he-she agrees which is very very unlikely. then try to implement same with your colony-society-village-city-country- world.
If the neighborhood is not a good choice then Try with your best friend's family or your distant relatives.
You are brainwashed - there are open communities EVERYwhere on this planet. You are just living in your bubble so you dont know.
Also, having personal privacy is not the same thing as having borders.
A country is not a home.
The World is divided into continents and then continents into countries, countries to cities and so on, till we reach to the individual homes. All this division is to decentralize the power. If there was a one country and no borders, how could a single man control all the countries or rather the whole world ?
A borderless world will be a big mismanaged and abuse of resources whereby the people will use illegal means to acquires resources and the crime will rule.