To all those thinking about Boeing only producing 3 aircraft, you want to tell me why wouldn't it be the same with Airbus? Airbus aircraft are not any more advanced, modern, or efficient than Boeing aircraft.
As for the 757/767 age, the first flight may have been in 1982 or so, but by no means does that mean that they are not technologically advanced, or too old for today. They still are very modern aircraft, and most of them flying today are nowhere near 20 years old like some of you think.
The 747 has a long way to go IMO. I have a feeling that Boeing will completely redesign it, it would be like making a whole new program, but just with the same name on the tail, "747".
Some people are like slinkies - not good for anything, but they bring a smile to your face when pushed down the stairs