This is a pretty bad analogy, and even at that, it's not completely thought through. Google is responsible for a lot of the infrastructure on the modern web. Gmail, ad networks, google apps, data centers, etc... If they disappeared this weekend it would be chaos.
If exxon mobile disappeared, we might see an oil shock similar to the one in the 1970's, but more likely, due to strategic reserves, we would see a gradual increase in prices, followed by a ton of investment into increasing production capacity by the other oil companies.
If exxon mobile disappeared, we might see an oil shock similar to the one in the 1970's, but more likely, due to strategic reserves, we would see a gradual increase in prices, followed by a ton of investment into increasing production capacity by the other oil companies.