Why would I trust a company like Amazon with a root certificate when it doesn't even use HTTPS across its website?
The CA system is broken by design, but I don't think adding Amazon will make much of a difference either way.
edit: Downvoters--have you ever done measurements? Why do you think Amazon redirects HTTPS to HTTP for product pages? It actually matters and at their scale it's real money.
The answer isn't to attack Amazon, but to move to a model where basic certs (including wild card certs) are free or you don't get your root certificate in, only 3 companies get their cert in and none of the may be based anywhere but Germany or other countries that respect privacy.
But that is just the opinion of this random, angry, nerd.