Google being forced to close European offices and encouraged to repatriate European profits to non-European low-tax locations wouldn't stop Google Inc from continuing to run a business headquartered in California or dissuade 90% of European internet users from searching Google first.
If they go forward with it, it'll do more than raise questions. It'll ignite an international economic war, with mostly losers on all sides. Dumber economic mistakes have been made throughout history (eg the pre great depression trade / tariff wars).