This idea isn't yet ripe for the market, but one day, eventually, all the electronic stores and then the clothing stores will go out of business because everyone is buying everything online. Sure, people will keep walking into Best Buy to try on the headphones and listen to the speakers, but no one
will buy because it's cheaper online and there are no taxes.
Eventually all the real stores will go out of business and there will be nowhere left to try on a pair of shoes before you buy them. Thus, the Amazon Demo Store. It will carry just one or two of each item. And because of the limited stock, there will be more space to hold more samples, so the store can handle electronics AND clothing AND whatever.
Instead of checkout counters, there are internet terminals where you can order something to your home immediately. And the sales people are knowledgeable. They don't have to know anything about scanning bar codes so they can focus on the product. On your internet terminal, you can type in the sales guy's name and he'll get a bonus for being such a good salesman around holiday time.
But who will pay for the store and its employees and Dirk's bonus? The product companies! For them it will be an advertising cost. Timex will pay the Amazon Demo Store chain to carry their product and they'll even send out clock experts to train the sales people. They'll even supply the watches! Companies that don't co-operate won't have their stuff on display and thus lose business.
In short, the sale (explaining, convincing you to buy) and the purchase (payment, delivery, returns) are separated to operate more efficiently.
The problem with this idea, other than the aforementioned current, temporary abundance of real stores is that some people buying online are doing it not to save money, but because they're lazy and firmly intent on not leaving the house. So either the store needs to come to them, door-to-door like Avon, or we need to make the store more attractive, like have a waterslide or candy.
Another problem is that real stores will still exist because sometimes you want something RIGHT NOW! So Best Buy will still be around but it'll cost way more. And if the Best Buy Gestapo catches you testing out products without buying, you get sent to a gulag. Now you work in a mine in Siberia because you waited until one day before FIFA starts to buy your new TV.