This is the worst decision ever in a long time. Cloud services is taking off for real and are the next big boom in computing, and with this decision it becomes impossible to lawfully use American companies services in Europe and most of the rest of the world.
This is not just about American citizens but also any citizen abroad with an account at a US service provider. Anyone litigating in the US can get a warrant like this issued, from any country.
Talk about stabbing your own industry in the back. This is giving the protectionists a free reason to only keep services inside their borders all over the world, in local companies