Corporations are run by middle-aged people terrified of getting fired for agreeing with something unsuccessful, not bald men in highbacked chairs. An online retailer isn't going to engage in currency manipulation.
Amazon will never accept Bitcoins.
Neither will Google or Apple.
Those big corporations have an ego problem and also they will never go for something that doesn't belong to them.
Last but not least the entire current Bitcoin capitalization (250 mio $) is a grain of sand for them.
Less than a day worth of their turnover.
Bitcoin is still a colibrì, it wouldn't be wise to try to copulate with an elephant.
Never forget: size matters!
;-)
I now know what a colibri is. Something new every day...