Disregarding your belief that "a lot of people believe" this for the moment: since science is the process by which phenomena are investigated, then it becoming omniscient is going to make it rather redundant, n'est-ce pas? To quote the wise philosopher Dara Ó Briain again, "Science knows it doesn't know everything, otherwise it'd stop."
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'