This type of thing is just their last hoorah, before Eric Pickles proves he's NOT a toothless tiger.
Yes, they'll wait until the $cars and CCTV Enforcement are actually made illegal before they stop using them. It could be, of course, that their Contract with whichever PPC stops them withdrawing them immediatly due to penalty clauses, but if they're made Illegal that couldn't apply.
Mr Pickles also has to go through a Consultation Process before the $cars/CCTV can be made Illegal, so they may be hoping to play the 'child safety card' durig that process - after all look at the money they will lose!