What this means is that bishops should never be appointed who are not tainted with whatever nonsense has got a grip in a local area. This is a recipe for schism: it is so obvious that it is amazing that these bishops can keep a straight face. If the bishops of a country drift away from the teaching authority of Rome, and if it is a principle that no new bishop should be appointed who isn't 'with' the existing self-appointed gang, then clearly they are going to go on drifting until they have given up being Catholic altogether.
As Rorate Caeli says, if the Pope accepts this, the game is up. But the worst thing is that this is, as far as it is possible to discern, essentially the principle lying behing appointments to the sees of the United Kingdom, and indeed most countries, for several decades.