Sure but except in maybe a few circumstances you shouldn't need someone else's organ. This may be one of the places where modern medicine is actually superior, but in general there are better treatments than they offer. Diabetes, high blood pressure, cancer, autoimmune disease can all be cured and don't need to be 'managed' with a lifetime of pills and side effects. However, there are some diseases with genetic causes that cause organ failure that cannot be fixed so transplant may be necessary. I would still contend that genetic diseases are caused by environmental toxins and hence most of those diseases have shot up in prevalence since we started using pesticides and pumping sulfur and nitrogen dioxide into the air beside cities.