“But claiming that, because millions of people have preexisting medical conditions today, they risk being denied coverage if Congress repeals Obamacare is like saying that, because millions of Americans live within five miles of the seacoast, they risk being killed by the next hurricane if Congress cuts funding for the Army Corps of Engineers. Such simplistic and superficial methodologies deliberately ignore all the other relevant factors that might lead a reasonable person to question their outlandish conclusions.”

Another good article from the Heritage Foundation.