The taxi companies in my town have always offered package delivery (though I've never seen it used much). The idea isn't new, though the technology could help out with the practicality of it.
Yep. I drove a cab for about a year (2003ish, college town of ~200,000 people), and the company I drove for did this. It wasn't a big business, but there were a few substantial accounts, notably the local university hospital system, which sent around a lot of specimens in very serious-looking containers. Pre-ubiquitous GPS, shared taxi dispatching and routing involved a lot of yelling and guessing.
No one said the idea is new. Uber's not new. AirBnB's not new. Instacart's not new. There's pretty much no reason to point that out.