What Fans Want: Just as GTA V introduced the ability to switch between characters with a few button presses and a brief wait, wouldn't it be awesome to travel between different time periods and locations with the simple movement of a wheel? How this would work is anyone's guess, but to be able to transfer characters to starkly different locations or just pick up a different story with another character somewhere else would add a huge array of diversity to the series. As for the time period, what about being able to switch between a modern-day protagonist and his crime boss father back in the 1970s, Godfather Part II-style? It'd be like nothing the series has seen before, and the earlier time period could heavily inform the later one. Why It Won't Happen: Given how well the character-switching addition went down, it's unlikely they'll introduce something this daring so soon, if ever. It has the potential to over-complicate things story-wise and poses obvious technical challenges as well.