You can already spend bitcoin on amazon.

Gyft.com sells amazon gift cards for bitcoin.
Its pretty cool, you can checkout and go get a gyft card in under 5 minutes.

Purse.io also lets you buy your amazon order with bitcoin, it takes a while but gives a discount.

If you time the price fluctuations lately you can get some good deals.

I heard about those "change" petitions to not mean that much .. can't tell
But I am 100% sure there have been plenty of those for amazon already

if someone wanna join the petition

https://www.change.org/p/amazon-com-amazon-com-accept-bitcoin