If President Trump, hopefully, does issue the 1st EO mentioned in the article, then all McCain will have for medical insurance is Medicare, Tricare for Life (which acts as the medigap insurance for retired military) and the VA. However, he does have his wife’s fortune to pay cash for his medical treatment, which nearly all of us don’t have.
Medicare and Tricare for Life is what I have and I’ve never had a problem getting care for myself or my wife who was treated for lung cancer for 4 years before she died.