I think you're overestimating the US's role on the internet.
Look at china they seem to be doing ok although their reasons are completely the wrong ones for doing it.
Yes a blockade for a couple of days would be a good idea however I'm afraid Europeans are being underestimated by the US so if we don't have the determination to stick to it it's not worth doing.
But why assume that these European replacements for American web services wouldn't either be complicit in spying for their home countries, or the US? Why is a Great Firewall of Europe better for Europeans' own freedom?
Because of accountability. And I am much more confident about the EU than the US regarding the possibility of stopping the surveillance dystopia.
Yes, bad things happen over here too, but the indifference of the public has received a huge dent, with the lid now blown off the BND and GCHQ stuff. Also remember, that privacy is a huge issue for the general populace in some countries (Germany, Poland, Bulgaria).
Look at china they seem to be doing ok although their reasons are completely the wrong ones for doing it.
Yes a blockade for a couple of days would be a good idea however I'm afraid Europeans are being underestimated by the US so if we don't have the determination to stick to it it's not worth doing.