well, there is no perfect solution, sometimes nobody can score in a Greco match and someone has to win. they could leave it to the referees to decide who is more "active" but we had this before, that usually means corruption and double standards and lots of protests, another option was having overtime until somebody scores but that could mean endless matches which I still prefer but I understand why UWW doesn't want that.
as I said this is not perfect but at least with this new change nobody will be passive intentionally. in Paris we had some matches where both guys wanted to be passive and that was really ugly.