It does help to perpetuate a myth that there are alternatives to exercise which could enter in to a persons decision to exercise or not, even if they decide to do something else with their time.
Every generation has to create its effort-free alternative to exercise, whether it's electrodes you attach to your abs or standing there while a vibrating belt shakes your body.
Even George Jetson would sit around while the computer exercised for him, so I guess we know what's coming in the future.
People who don't exercise simply die young (in their 50s and 60s) and people who are healthy can cling on for decades fully utilizing the range of expensive treatments.
I would agree that a billionaire with predictable medical expenses will more options than a person in any sort of health and likely live longer. Most people in bad health don't have unlimited money thought (simply because most people don't have unlimited money).