This 5-minute presentation will convince you that Amazon is screwed (opens in new tab)

I don't know if I'm convinced. Yes, overcapitalized clothing retailers have had a horrible time online, but the Nasty Gals of the world are doing just fine (at least until you actually see the clothes)

tl;dr In the past, some (entirely) online eCommerce stores have failed. Thus Amazon may fail since it has a similar business model.