Why would the world feel the need to compromise when all UN countries, except for one agree on the projection. The solution is simply to ignore the minority, especially if it has a government that itself has always refused to compromise with others.

When are all these countries planning to switch over to the new map?

It's a GA resolution. Vanuatu gets the same vote as India. No actually consequential global decisions could ever be made this way, so it's no wonder it's mostly used for symbolic votes like this one.