what economic incentive does the healthcare world have to adopt something like this?
Not much, which is why this service should not be offered through the standard healthcare system. I can see two other ways to do it:
(1) I walk into a drugstore, sit down at the testing machine, select the tests I want, swipe my credit card, and the machine takes a drop of blood from my finger, runs the test, and gives me a printout of the results.
(2) Home testing kits for every common lab test, not just blood sugar.