This could turn out to be a great service. The drawback to any alcohol delivery, is there will have to be an adult at home to accept it. I can't think of a way around that requirement when it comes to a legal delivery.
UPS had a few wine distributor accounts back in the mid to late 90's and there had to be someone home to accept and sign for alcohol parcels. It only takes one instance where alcohol is left outside a home or business unattended and some underage individual(teenager) to grab it, consume it and do something stupid under the influence before there are countless numbers of lawsuits filed. UPS was constantly being dragged into court because of something that I just described happening. At UPS, we were not allowed any indirect deliveries with parcels that contained any alcohol. If, you weren't home, a notice was left, and I can tell you that most of the time the intended recipient ended up traveling to the UPS hub to pick up his parcel.
I can't think of any circumstances that anything has changed.
I know it sounds convenient, but, in the end, it was more often a headache for the consumer than just running to the store and picking up whatever it was you wanted.
How Amazon will be able to get around those legal requirements will be its greatest challenge, and to be honest, I'm not sure there is a way that leaves Amazon free and clear of the obligations of the laws concerning alcohol.
Just a thought . .