What if Google were to switch entirely to paid advertising?
Natural organic search results are what the search engines are made of, therefore you never have to worry about them switching to totally paid advertising. Google and other search engines have the ability to take any search query (of which over 50% are completely unique) and return results in a very specific order of relevancy. This product allows Google to be able to sell advertising space and other products. If organic search were to be banished, Google would be out of business very quickly. Organic search results going the way of the dinosaur are about as likely as the sun failing to come up.