The thing is even if the law is altered from it's current wording, we don't know how it will be applied. It could be interpreted that any individual or business involved in owning, running or hosting sites that offer sex for sale (with somebody other than themselves) will be breaking the law. Even if it is applied more leniently, many site s will get rid of us as soon as it is passed to make sure they stay on the right side of the law.
For example I personally expect that site builders such as wix and squarespace will no longer be willing to host escort sites in the UK if this hideous mess of legislation manages to get through.