I don't know where this self-proclaimed fact comes from but hell I know a lot of people that define themselves not as non-materialistic AirBnB-Homejoy-Uber users. Instead, like everyone else on this planet, they want to express status with watches, cars and houses. Some maybe even enjoy mowing their lawn and cleaning their house, as it cleans their mind from stressful work related stuff.
Yes, Uber and AirBnB are great services and we will use them a lot more in the future, but this doesn't mean that everyone will use a dogfood-delivery or brush-my-teeth service. The DIFM-Economy surely will exist, but it will probably be far smaller than silicon valley based journalist imagine it.