There's an article in the New York Times today that covers diabetes management technology and the large recurring costs of diabetes supplies
As others have said, non invasive monitoring is the holy grail and huge amounts of money are looking for a non invasive solution. But innovation here is likely to come from a start up that doesn't have the existing recurrent revenue model to be disrupted
But it's really hard. I think the chances of this particular one being a scam are pretty high