Actually Boeing offered this type of aircraft to the airlines about 1-1 1l/2 years ago. I believe that it was called the 747-400ERX if I am not mistaken. It had the fuesalage of the 747-200 and the wing root insert and wing of the 747-400F. While the aircraft had better performance possibilities over the 777-200LR and A340-500 airlines opted not to pursue it.
"History does not long entrust the care of freedom to the weak or timid." D. Eisenhower