Not doubt, AMZN will be a big player in online retail, e-book, and cloud computing business.
However, it needs to figure out a way to make good margin. By nature most of its business are low margin. Its high stock price can not be justified without good margin. Business is business. It's not charity. Apple iPhone cost is only around $200 for all its components. If iPhone sell it at $300 without any contract, Apple can get over 90% market share. However, Apple definitely will not do this because it can sell iPhone over $500 each.Amazon will never be able to get margin that Apple can get, even 30% of that.