They've already started to somewhat monopolize the search market.
There are two types of monopolies, Coercive and Non-Coercive Monopolies. Google is a non-coercive monopoly, so let them enjoy it. They certainly deserve it. In a non-coercive monopoly, people always have the choice not to make use of a service. No one's "forcing" people to use google, it just got that way because they are good.