Weren't trolls like you supposed to not be on this site?
On the topic I think the quality of food delivered is going to hurt the delivery businesses. Fries are the perfect example where you cannot stick them in a bag and delivery them 30 minutes later and have anything but a soggy mess.
I agree with others that these businesses are not going to scale but may survive in very small places where higher end food can be delivered and the fee is a smaller percentage of the total food bill. Delivering cheap fast food isn't a good business model.