An easier way to create a second village would be nice. Instead of going through whatever long process people find on YouTube or Google, adding a way to switch villages in the settings would make things easier.
Having a second village has many advantages on both sides ( Supercells and Consumers).
For the consumer it would give a test village to really good around on and not worry about losing trophies on the village. For people who rushed their village, they can go back and create a village with new knowledge and experience. Plus, I bet some people miss the quick building times and how fun the beginning of the game was.
For Supercell, it will keep players interested in the game. Adding a level of replay-ability will keep people around longer. It gives the people who maxed out their townhall ten base something else to do while waiting for townhall 11.