The robbery theory is irrelevant.
In the end it will come down to two factors, regulation and money.
Current regulation is nowhere near suitable and any changes will take years rather than months.
Money is the big hurdle, drone delivery will be more expensive than a man with a van so the customer will have to pay a premium for fast delivery. How many customers will be prepared to pay the (as yet unknown) premium and more importantly is the market big enough to justify the investment in the required infrastructure. The corporate bean counters will decide.