Is this a question?
Seeing how nurse practitioners don't particularly enjoy working in them, and the businesses can't really afford to pay them.....I suspect they will dry up as all the other fads did.
Remember the boom in CT-screening centers? Well, the providers grossly overestimated the number of people willing to pay out of pocket for needless scans, and it's now all but gone.
I suspect this will be the same way.