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There are plenty of valid concerns and complaints about Amazon (I'll list some of mine below), but I don't see why you're blaming them for electronics recycling and lifetimes, or "Walmartification". Amazon has done a pretty good job of being an all-in-one place to shop online and having very low prices overall. For cellphone replacement cycles, I have absolutely no idea where you get the idea that Amazon has anything…
In response to 1) The phenomenon you're viewing is usually the opposite of what you're suggesting. Amazon is trying to let you opportunistically buy things at a lower price by allowing prices to change frequently. Part of the appeal of Amazon is being able to get something on your doorstep in two days at the click of a button -- if this isn't something that interests you then services like Ebay might be better -- but…
What I do see these days is counterfeit stuff. It's really easy to avoid this stuff though: there's a checkbox on the left that lets you filter results to show only US sellers or North American sellers. Filter out the Chinese sellers and the counterfeit stuff goes away. I've never had a big problem with late shipping, but if you're the type who demands stuff ASAP I can see how you'd be unhappy. The big thing you can do on Ebay is be careful who you buy from and look at the feedbacks. Huge-volume sellers with good feedback are usually pretty safe, and ship quickly. Low-volume occasional sellers with 100% feedback are safe. Foreign sellers with spotty feedback are to be avoided unless it's something really cheap and you're willing to take a gamble on it being junk (if it doesn't show up at all, Ebay will refund your money). It's really not that different from Amazon in this regard, since so much stuff on Amazon is sold by "affiliates", a bunch of whom are Chinese sellers, or otherwise independent companies that ship themselves rather than outsourcing that to Amazon.