They would never abandon the US market, but they'd certainly consider moving HQ to another country and making it the base of their parent company. They already

They would never abandon the US market, but they'd certainly consider moving HQ to another country and making it the base of their parent company. They already are based in one of the highest corporate tax rate countries in the world (with CA taxes they pay about 42% on US profits, which is why these companies don't repatriate profits from foreign subsidiaries to the US).