Hmmm, I got an idea.
Maybe burning Bludhaven would make for a murder mystery story people woild like. I mean, burning the city literally by the actions of some kind of arsonist with unclear motivations. It would both work with rebounding Dick with the city, getting to know it, interacting with characters to meet and deepen their relationship, and build up some kind of catharsis that brings Old Dick back. It doesn't meed to be too overdramatic (like see, nuking the city, or bombing his place or something); just open the story with some kind of oldstyle impact (an imposible fire that got killed a well known figure in the neightboorhood in a rather gruesome way, for example). That first impactful event would catch Dick's interest, and then the story slowly progreses. Could be that the fires are small, but all unlikely to have happened; could be that the city it's being flooded ironically; could be that there are various arsonists with several different, conflicted interests (economics, politics, religions: you name it); could be that in the end it's all because some alien artifact that manipulates people's minds; could be the pulling strings of some acquaintance of Dick that seems like a bad guy but in the end just make an unforgiving mistake that is getting people killed. I don't know, just build a murder mystery story from basics, from classics, and add a few random unusual-for-the-genre elements, and see how it all rolls. Maybe towards a grand finale with some part of the city burning to the ground while the characters reach their realizations and their apotheosis.