Prescriptions have been available with delivery or mail order service for at least the last ten years. I have worked for at least two private pharmacies (in different states) who offered delivery service, and several of my classmates went to work for the mail-order fill companies as the "stare and compare" pharmacist checker.

The VA offers mail delivery for prescription medications. I imagine it has something to do with it being a single payer system, & they have to look for any chance to optimize in the whole medical food chain instead of just the pharmacy portion.

cvs caremark and express scripts already send out billions of scripts via mail every year. Mostly maintenance medications, of course.