Sounds like it'll only ever be a dream. Assuming they can keep sabotaging their way towards market dominance, eventually they'll reach a point where they have to deal with humans directly - and with humans you get problems you can't solve technically.
They will either have to dedicate people to strictly or mostly food delivery, or offer an annoying service where your driver has to make a detour so he or she can pick up a hamburger for someone else.
You call it an annoying service, they call it UberEconomy!
(In all seriousness, I think there could be a market for almost all of their ideas. The problem is the need for seamless integration and management of human assets that have little allegiance, combined with small, test markets, makes it hard to predict what services will take off and what will flounder)
They will either have to dedicate people to strictly or mostly food delivery, or offer an annoying service where your driver has to make a detour so he or she can pick up a hamburger for someone else.