Sure, Kmart/Sears might have gone online as well ... which would leave behind the advantages of physical scrutiny of purchases without the added shipping charges. I find it really hard to leave behind that approach to shopping. (I haven't seen any pros-and-cons for the environmental costs ... but I've noticed that nearly everything Amazon delivers arrives inside a throw-away box delivered by non-green vehicles.)
The idea of buying something online without being able to truly inspect/compare quality is a really big loss. (Trust the reviews? Not so much.)