So your fear, as stated previously, that I suspect the NHS is being run down so it can be sold off to US investors is not actually a concern. If the NHS were "dismantled" what would happen to the parts? Would all of the hospitals, surgeries, labs, radiology centers, etc. simply shut down and let go of all of their staffs?
Post dismantlement, where would those who could not pay privately queue for care?
As evidenced by this thread, you already have private medical providers in the UK, who presumably have lower costs somehow than US providers. If they can do a knee replacement for 10k quid, why would someone pay 15k to have it done by a US based provider? If American companies can't compete in the UK market, they will fail. If they can compete, you're better off by having more choices.
It's not because of some nefarious plan on the part of US investors or healthcare companies that the NHS is underfunded and has bonkers waiting lists, which creates a need for private medical care.