Why would we want to turn the clock back? The solution to monopoly is to put those industries that have managed to make it to the top of the capitalist food chain is not to break them up (and risk destroying jobs and undermining the rationalization and centralization of production), but to bring them into public ownership. Monopoly in and of itself is not bad, but monopolies controlled by private capitalists are because they have an interest in fleecing the public.
Private monopolies may be bad, because they have an interest in fleecing the public. Public monopolies are much worse, though, because they have an interest in raping the public.