Nah...AMZN the stock will go down. AMZN simply cannot sustain the level of growth rate required to main its current valuation.
AMZN supports the sales tax because they don't want someone to come along and did what they did - destroy local economies through an unfair advantage. That said, AMZN still faces formidable and entrenched competitors with deep pockets. Do note that their competitors are profitable business with a razor sharp focus. Unlike AMZN, they don't chase every shiny new ball to mask losses an inability to compete on a level play field.
That's actually true. Amazon's goal is to be the worlds #1 online retailer. They define this as by conducting the most business dollarwise. (In my opinion, profits should factor into this equation somewhere, but that is besides the point).
This is going to hurt margins across the board. Squeeze out other online retailers. AMZN doesn't care how much money it loses or never makes, it just wants to be number one and crush competition anyway and anywhere it can.