You're right but it has a chance to be widely adopted if it's the doctors themselves that are telling the patients "download this app, and use it the next time you have so and so". But if there's no doctor telling people to use it, you're absolutely right. The ones that stand a chance of being popular are those recommended clinically.

The others (like Fitbit, Jawbone, Basis, etc) are all niche products and they will quickly learn the harsh reality of fickle consumers who rather poke people on Facebook than track their health, even though one has far greater future benefits.

People who think mobile health is an emerging, cool trend need to take a step back, and ask not just what problem they're solving (btw, anyone ever wonder what problem FitBit is even solving????), but how to persuade/engage consumers in being proactive and using their app/device. If they can't solve that problem, they need to find out how to persuade hospitals/doctors/insurance companies that these apps can save them money or time.