
I am already observing some effects of their market dominance (which is similar to what has happened with other chain stores once they get established)
Prices have risen to the point, that bargains are no longer great. In some cases, they exceed local retail (when S&H is included).
The 900 pound Gorilla flexes its muscles at the purchasing table, much to the dismay of the BPH.
Retail stores only stock items with High Volume turnover or High Profit.
Remember Sears & Robuck or Montgomery Wards? America could mail order 1,000's of items that local stores (if there were any) could not stock. They are (mostly) gone.
Amazon has refilled that gap
What is still great about Amazon, is Selection and return policy.
How long will it last before Big Business style management intrudes?