The future of delivery will be specialist delivery firms such as Grubhub (NYSE: GRUB) and Instacart that concentrate on one kind of order such as groceries or hot meals. One-size fits all delivery such as that promoted by Uber Rush appears to be a flop. Other delivery services will take the place of Uber and Lyft, and customer service should not be affected, Blakeman said. Walmart owns the same-day delivery service Parcel and is working with some other delivery services including Deliv and Google Express. Walmart is also working with Postmates and DoorDash, Reuters reported.