As for the heroes, no one knows quite where they went. Some people are guessing that they ascended to some deific plane of existence; others figured that they just left when they weren't needed. The favored theory is that they're needed elsewhere, that after the Praetorian invasion they found someplace in greater need of heroes. There's no memorial in the city, but that's because everyone still remembers.
Not every random WRUP opening needs to be funny. Don't worry, we saved some jokes for our weekend plans just past the break. Let us know what you'll be up to in the comments.