This is the trojan horse. Once Amazon has a large presence in each major centre, the next logical step for them is use some of their massive space as a showroom (think Ikea but on a much larger scale). [Edit: To clarify, the showroom and warehouse would be in the same complex but separated. Shoppers + heavy merchandise + fast moving robots is a recipe for disaster.] Then they can satisfy both the "I want to see it be…
Interesting idea, but I seriously doubt Amazon would do this with their normal warehouses -- maybe paying sales tax and thus being able to have presence in major cities would let them set up dedicated showrooms for certain kinds of high-lifetime-margin products, like Kindles and maybe a Kindle Phone, though. Big warehouses are highly automated (especially Amazon's), essentially unsafe for untrained people (forklifts,…
I don't believe the robot technology is quite yet up to this. But in 5-10 years it should be.
This setup would feature primarily first party products but it would also be possible for third party products to be on display in the showroom (to be delivered later from a different location).
I agree that Apple-sized showrooms with mid to high-end first party items would be the logical first step.