And the french started cutting benefits already in 2014 to make sure that didn't happen.
Right. So you're saying the French single payer system works, with political modification as needed over time.
The issue that might make single payer difficult in America is we don't trust our political system to manage good programs, because the GOP is committed to destroying government (to benefit the super rich) rather than trying to get things done.
Be careful with articles about single payer healthcare systems in the US. Most similar countries to the US have functional single payer plans. It's a false talking point pushed by conservative media that those systems don't work well. Conservative media pushes those falsehoods because the media is funded by the very wealthy and those who want to cut taxes to line their own pockets at the expense of most Americans.