If Google disappear tomorrow, another search engine with same function will replace it. Why you ask such a question? You shall be happy that there is such a search engine like google which can help you too much.
If you are worried about your future generations, then its valid.. If about you, then its highly unlikely that something as big as Google will disappear.. Will Microsoft disappear? or get replaced that easily.. No! I am not depending on google anyways, nothing of much importance to be besides being a fine search engine
I agree... As long as the internet remains as it currently is there's no way Google will go bust... As long as there's demand for info Google will be there. With all the new content that's added on a daily basis they'll become stronger as long as they keep up the pace with "improved" algorithms that will keep on providing people with relevant search results.