Earlier today i saw (yet another!) study on mHealth adoption, but this one focused specifically on Apple's influence. The researchers credit Apple with bolstering the market and expect Apple's smartwatch to further explode the market. They don't have a lot of stats to support this; the report didn't include any leaked pre-orders, for example. If Apple has figured out the way to encourage physicians and others to 'prescribe' these devices to the millions of diabetics, overweight, people with heart problems, as well as those interested in health, fitness, diet, etc., then I'd say they're onto a great thing. If insurance covered a percentage of these devices or they were included in health saving accounts, I'd imagine that would further propel hardware sales, especially now consumers are more and more responsible for more of their own health costs (through higher premiums and/or deductibles).
I predict we'll see that happening, although i don't know if it will be in 2015. But certainly one day in the not too distant future, you'll be able to write off your Fitbit, Apple iWatch, or $1.99 nutrition app, i'd guess.