Eh, it's not that far away if we really wanted to push it. Just add an airfoil envelope with enough of something lighter than air(heated air, helium, w/e) to o

Eh, it's not that far away if we really wanted to push it. Just add an airfoil envelope with enough of something lighter than air(heated air, helium, w/e) to offset the weight until a decent performance point is met. The heat from the engines running could help heat the gas for added efficiency. Hybrid airships are already being marketed by Lockheed Martin so this isn't revolutionary at all.