I doubt i. He's been de-aged before. But i imagine he'll be cloned or a new character will take over the lead role or something.
Theres been a few stories now that have had readers speculating that the "last Dredd story" is being built to. Including the current goings-on where Dredds been arrested and charged with the murder of a bystander. But so far its continued on. I highly doubt theyll end the strip.