I know everyone and their whippet has one of these (even Shaun the Sheep and Wallace and Gromit share a universe!) but how about an 'equal' instead of a sequel? Don't name it after Dredd - introduce a new-ish player. Call it Chopper, or or Anderson or what have you, have JD appear in there for a bit as antagonist or supporting character, but emphasise the world-building aspect. Avoids the stink of past disappointments via a Dredd title, but still offers the same world, the same huge cast of players?