I suppose they could...but that would be a bit like Spartan Games shutting down all support for Firestorm Armada for 10 years, and then doing a limited re-release of the Battle for Valhalla box set. Don't get me wrong, I'd take that over nothing, but it falls short of a full re-launch of the game.
I think it would be more likely that GW will do something akin to Dread Fleet...In Spaaaaace! To contine with the Firestorm analogy, that would be as if you had a box set where a Terran battleship, Aquan carrier, and a Sorylian cruiser faced off against a Dindrenzi dreadnought, a Directorate battle cruiser, and a Relthoza destroyer!