Given the disaster this is likely to inflict on search results if scaled up, and the fact that it's not required in America, do you really think they'll make the whole global search engine work this way? Or do you think they'll do the same thing as done in every other case where some stupid country requires censorship: block based on domain name or IP address?

Historically, for Europe it's been done via domain name. Doing it via IP address would not be any more effective though: there'd immediately be dozens of proxy sites set up running in the US that simply forward the search to the US Google and return the results.

Short of building an equivalent to the Chinese Great Firewall and blocking all encrypted traffic, or forcing Google to apply European cenorship globally, there's no way to stop Europeans who want regular results pages from getting them.