I imagine the Filth hate it - with 2 or 3 people a copper on their own or in a pair can deal with, but with 6 being the new magic number it's going to be larger groups they're going to be wanting to disperse, with greater levels of belligerence (nobody will want to be the 7th, 8th, 9th etc person, different dynamics as we get towards crowd psychology and so forth), leading to more calls for back up before anything is broken up, leading to more bravado, leading to increased levels of violence necessary to enforce the diktat, and so on.