Personally I haven't found much of a use for naturopathy. Their popularity might be on the rise a bit but I am not sure why. The ones I have met are fairly good at diagnosis and maybe preventative medicine but they often seem to think that their field rivals the abilities of MDs and DOs. Some think that they are equals or better than those trained in western medicine. However, the list of conditions that they can truly treat or cure is very small. It is hardly a broad based or true alternative to western medicine.
Modern naturopathy has been around for over a century and I am still unsure what they have done to advance health care. There is very little in the way of research, very little evidence based medicine, very little organization or oversight, and all the ones i have met (which are many) seem to think that MDs are the problem with our health care system. The last time I checked, naturopaths haven't cured our society of anything like polio, smallpox, or syphilis, yet a lot have a rather cocky attitude. I am sure that there are herbs or botanicals or other natural treatments that are effective for common conditions, but i doubt that NDs or really anyone is sure which ones can do what.
I might respect the field a little more if they took a heaping dose of modesty and would admit that they are very limited in what they can do. If people want to go to them, that is fine and i think they should be able to practice in all 50 states but not as any sort of alternative to allopaths or osteopaths. Now I am not closed minded and think that this field shouldn't exist. However, right now I think naturopathy is still in its infancy and is going to need many years, if not decades, of solid research before they should have a major role in our health care system. Until they can demonstrate the effectiveness of their treatments, i think i will steer clear of NDs and stick with MDs to help me with most health concerns.