Arrow: 10 Major Predictions For Season 5
8. Oliver Will Be A Terrible Mayor (But Keep The Job All Year)
Oliver Queen is now Mayor of Star City, which should at least guarantee that the death-curse placed upon the position is lifted, but that's about as good as it's expected to get.
Oliver is very well intentioned and genuinely wants to help Star City, but he's a vigilante, not a politician. Stephen Amell has said in interviews that he's no good at the job, and that's something we're likely to see playing out across the season. After all, he has to juggle that with being a vigilante himself, and training a whole new team of them too.
However, come the end of the season, I imagine we'll still see Oliver in the position (but remaining terrible), with him as Mayor becoming a plot point that can run well into a sixth season (should it happen) - and then maybe eventually stepping down and passing it on to someone else, quite possibly Thea, since she's going to be the driving force behind it all anyway.