I don't think this represents any change for European pilots. We're supposed to have been carrying passports for the past seven years:
(1) 14 CFR 61.3(a) is amended to require each person to carry a photo identification when exercising the privileges of a pilot certificate.
The FAA revises 14 CFR 61.3(a) to require each person to carry a photo identification when exercising the privileges of a pilot certificate. The photo identification in most instances likely will be a driver's license issued by a State, the District of Columbia, or a territory or possession of the United States. It may also be a government identification card issued by the Federal government or a State, the District of Columbia, or a territory or possession of the United States, a military identification card, or a passport. Under this rule, a credential with a photo issued by an air carrier or airport operator that provides unescorted access to a security identification display area at an airport regulated under 49 CFR part 1542 is acceptable. The rule also permits other forms of photo identification that the Administrator finds acceptable.
Note that a European driving license doesn't count and nor does your Blockbuster card. For Europeans, excepting the rare people who have some form of US government or military photo ID, the only qualifying document is a passport.