I do not think Suzanne should write a fourth book in the 'THG' series. I think it's good where it was left off. Though, it would be interesting if there was a fourth book of short stories. By example, a short story written in the pov of haymitch when he was in the games. Or the story of Mags when she witnessed the war before 'THG' we're created. Something like that would be great to read.
Fandom Worlds ~ Harry Potter (Hogwarts), Percy Jackson (Camp Half-Blood), Hunger Games (Panem/ The Arena), The Maze Runner (WICKED/ the maze), Divergent (Inside the fence), The Mortal Instruments (The Institute)