I know you are going for funny point mods, but the real advantage here to Dominos is that NO gratuity is expected at all. If the price is the same then they will sell far more pizzas as people won't have to worry about tipping enough, or being dressed well enough to greet a stranger at the door, or have the front living room clean enough as said pizza person casually stares past you as you fumble for your wallet. Just talking to a stranger is a task for some socially awkward people. It will be perceived as safer also. No one casing your home as they deliver pizza. When you factor in the energy and gas savings and once it is perfected I bet the per mile cost is 1/10th the amount with a delivery person.
Yes jobs will be lost. Drudge jobs we as a society shouldn't be expecting people to live by. As for students, their time is better spent studying than trying to pick a few extra bucks, because like it or not, the no skill jobs are going away. Even many skilled jobs are in peril. This will be an awkward 10-50 years as we learn to adapt society to a not-everyone-has-to-work society. Corny as Star Trek's 'we work to better ourselves' slogan is, the only non-dystopian future will have to be this way -- where you are not compensated for the work you provide, but by how well you prove you are constantly learning and helping society as a whole, and yes for same that will be a regular job kind of work, but for most it will be community service and continuing education.