Depends on what king of monopolies those are. We are better off with an Apple (smartphone) and Google (search) monopoly because they are pretty good in their quality. If they slip (like blackberry or yahoo) someone will throw them out pretty quickly in a free market.
In a non-free market government will eventually help someone accumulate lot more power and money without a competition is sight. Government is the reason why Google fiber is not available in Sunnyvale.
It's one thing to replace a mobile phone that you replace every two years anyway. It is another to pull a fibre optic cable through half of your neighbourhood all the way to your living room. The acquisition cost of a new client for utility companies is prohibitive, so it is biasing capitalism a lot (very little competition).
I can't think of a situation in which a monopoly has benefitted consumers over time. I'd kill for a 2003-2008 era Google search product, but the competition is slim. Not to mention, Google likes to use its monopoly to encroach upon other markets.
In a non-free market government will eventually help someone accumulate lot more power and money without a competition is sight. Government is the reason why Google fiber is not available in Sunnyvale.