Very unlikely - the EU has proven it cannot build a Google competitor worth a damn. Instead what would happen is that Google would have no corporate presence here but the website would still be accessible, and people would just continue using it as normal but with fewer local customizations and the only ads they'd see would be from American firms, or from European firms that buy ads via American subsidiaries / brokers.

I personally doubt it, mostly because Baidu is a similiar boat and hasn't been a spreading competitor of note in that space. Not apples to apples obviously due to several reasons admittedly, but that is most country to country comparisons.