They don’t even have to “make” retirement illegal, sometimes it takes care of itself. There are a LOT of people in their 70s and 80s who are working today and not by choice, since their gold-plated pension fund went belly up along with the company back in the 80s. I suppose that was a portent of things to come on a smaller scale.
The difference now is a HUGH demographic of “baby boomers” who will probably overwhelm the system just as they did for everything else.
Fortunately, the baby boomers won't live forever. In another twenty to thirty years, they'll be dying off in record numbers.