You guys are thinking only of the off-road prowess -- which is NOT why Hummers sell.
Imho, it's about the looks. Macho, mean, yet sophisticated. Kindda like the modern metrosexual man (or Martha

).
The new Hummer gotta go bigger. The soccermoms need to haul 9 teenagers to soccer, not 5.
Of course it's gotta have front locker & CTIS options for the trails. But a chrome hidden winch bumper would sell TONS!!
Better mileage could perhaps be achieved by making the new Hummer LIGHTER (even if it is bigger). Think of how great those "dent-proof" Saturn PLASTIC body would be the next time you slide sideways to a tree!!
Oh yeah, did I mention more chrome??
