Uber's MVP product improves upon all taxi services. Hailing a cab with an app is much better than making a call and hoping they show up. But all the extra work

Uber's MVP product improves upon all taxi services. Hailing a cab with an app is much better than making a call and hoping they show up. But all the extra work getting people to drive in the spare time doesn't really add much value. It's only viable because they are dumping money in the market to subsidize it. Uber could co-exist with taxis. In many cities you can hail a regulated cab with the app.