The trouble with these changes as I see it, is primarily that they will now have the status of a Ambassador, where they can't be impeded or their assets seized, should we want to stop them. Embassy staff and other A'holes with this sort of protection have made a mockery of US laws many times.
It would be interesting to see what would happen should they try to arrest someone here (US) and the homeowner came out shooting ... mistakes have been made by our own LEO’s going to the wrong home as well ...