You don't need government to do anything to end up with monopolies, especially in activities with very high cost-of-entry such as utilities or telecommunications.

Ma Bell became a natural monopoly all on its own, and barring an extremely disruptive entry into the market (which is, again, extremely difficult in high-entry-cost markets since the rate of new entry is so low) it will consolidate over time as the current incumbents reach the limits of possible organic growth.