I'll start believing this once you show that a "reputation system" (don't these already exist?) actually does anything to stop quacks from peddling diluted water as a cure-all.
If you relied on reputation alone to regulate the medical market, feel-good snake oil treatments would prosper at the expense of legitimate medical advancement.
The same "reputation systems" that saved us from the million miracle-cures sold on late night tv, from "green coffee diet" to "Oxygenated water"?
Do you honestly believe that people with a fatal illness, dealing with people offering a "cure" for that fatal illness, are free to make a rational choice?
Do nothing. Make your time. You are going to die pretty soon. Try to make yourself and your family comfortable.
Take what treatment your insurer allows. You die more slowly, with a small chance of remission, but also with a small chance that the treatment will kill you sooner. Maybe your won't consume your family's assets.
Take what treatment you can afford. Die even more slowly (probably), with a small (but probably better) chance of remission, but also with a small chance that the treatment will kill you sooner. You may consume all your assets, and or incur huge debt/bankrupt your family.
Get yourself into an experimental trial. There is some chance that you will be in the control group (if one is used) in which case, you will die. There is some chance to suffer some adverse reaction in which case, you may be removed from the trial, back to step 1. There is some chance to suffer some catastrophic adverse reaction, in which case you will die, and if you are unlucky the death will be worse than death by cancer/chemo. There is some remote chance the treatment will work as good or marginally better than existing treatments, you win, congratulations. There is some very extremely remote chance the treatment will work amazingly (as in fairy-tale amazing) well, epic win. It may cost little or nothing, but who cares what it cost, you're alive and you just helped save the lives of many others.
We have the regulations we do because we caused harm in the past. They didn't spring fully formed from the minds of regulators, they happened because researchers killed and maimed people by not doing the necessary verification before human trials began.