Notso, It is not only the fuel burn but overall maintenance costs that count.
We may not like it but with the exception of the A380 the world is going ETOPS.
They are still the main people carriers- the crews I hear talking about the two types actively dislike the 777
Having extensive experience of both I would choose the the 777 any day over the 747 from a flying point of view. Are you sure that you are not confusing people's dislike of the present 777 BA route structure and rest facilities which are demonstrably worse than the 747's?
It may not happen for a year or two but the writing is on the wall for the 747, wonderful aeroplane that it is.