I think there are people on the front lines who have a good idea of the technologies and treatments that work. The biggest impediments to implementation are often the insurers and regulators. Getting the unnecessary bits out of the way would likely result in a better and less expensive health care system in the US.
This article is a good example of plausible innovation being stymied and I'm sure it's not the only one.
The technique only recently received validation by a leading journal (NEJM). It will take time and additional studies before it is widely adopted. Keep in mind that while the limited case studies have shown minimal side effects, others will be seen as the sample size grows. It is never a completely benign process to expose one's bodily fluids to another.
Medical history is littered with extravagant claims for new medical treatments that end up being due to the placebo effect. Bear in mind that fecal transplant will have a HUGE placebo effect, so you need to rule that out before postulating that the treatment itself has any effect.