I've thought about this as well. It might be an event to include in a future version of VV. However, I think that only one of the construction projects (the bath, the statue, one of the huts, and so on) should be destroyed and need rebuilding. Otherwise I think it would be too severe. It should also only happen when the game has been played for some time, with all the puzzles completed and the population close to or on the maximum.