The rules which will most likely be in place will be neutering, wearing a muzzle in a public place, insurance and being on lead cannot all be implemented immediately, for instance even vets are not sure what age a dog can safety be neutered the age will have to be part of the new rules, some xls will still be puppies when any new rules come in so may be too young, you cant just shove a muzzle on a dog there has to be training to get them used to it, xl owners are already signing up for courses on this, insurance will be a problem Dogs Trust are insuring bullies at the moment but may stop doing so depending on the new rules, of course all dogs should be on leads even in dog friendly areas not just bullies my Pug was almost killed by an off lead Husky.
Implementation will be a key issue, you can't just add another type to current BSL as it has not worked since it it first became law in 1991, Battersea, the RSPCA, The Dogs Trust, the RVA and other organisations have said the same it does not work and does not reduce dog attacks, the way it is done is so random as to be laughable, just recently two dogs brothers from the same litter were seized under BSL and assessed which means just a tape measure, DNA is not permitted to be used in assessments temperament and character only make up 10%, one dog was assessed as a pit bull type and destroyed and the other was exempted, the whole thing is a farce, not all bullies look like the ones the press churn out with every news item, the mean looking ones with bandy legs, huge muscles, mean eyes and cropped ears, that tends to be the exotic bully one of variants but a lot look nothing like them, a friend has a boxer/staffy cross and people think that is a bully so with only a tape measure and no DNA evidence allowed dogs like that could be destroyed under current BSL.
Yes there is a worrying trend but for every XL attack reported 100s of other dog attacks are ignored, for instance an xl got out in my local area, it scared a lot of people but didn't actually bite anyone, my local paper was full of it, yet on the same day there was a mass golden retriever beach walk, there were numerous fights, 4 people were bitten one ended up in hospital yet it didn't even get a mention.