Saw 3 was super unpopular, so Saw 4 basically was a redo of sorts (takes place at the same time as Saw 3 and properly resolves the loose ends of Saw 2) and while it didn't undo Kramer's death, it did establish Hoffman as the new Jigsaw and Hoffman resurrected interest in the Saw franchise purely off the fact that Hoffman was a right and proper asshole villain who had no redeeming value and you wanted to see get his just deserts.
That said, I do hope/wish we eventually get a Spiral/Saw 9 follow-up. It was better than Jigsaw/Saw 8 and actually followed up on the idea of the idea of Kramer spawning Jigsaw cults with different people continuing Kramer's work and how his philosophy was going off into different directions