"The 747 is pretty much dead. Nobody wanted the 500 let it go. I love the 747 but its time to let it rest before"
Did you forget to finish your post...before what. A fairly brave statement but I think you will find the 747 being produced for some time yet.
A 777-400 would be TOO LONG and would probably suffer from tail strike.
The 747 is a classic aircraft that changed aviation forever and if the A380 is half as successful as the 747 it will be doing OK.
However I suspect the demand for the A380(initial orders excluded) will be less than anticipated and the ongoing demand for the 747 will be better than expected.
Unless Airbus give them away the economics of the 777 or 744 or A346 will probably be more economically viable, just like airlines now are parking 744s that can't be filled for 777/A340s that run full.
The 747 is a truly beautiful classic looking aircraft that despite being smaller actually looks bigger than the A380 which is rather ugly especially with the Cockpit on the lower level. Check out this SIA 744-412 and you will see what I mean!!!!
Click for large version
Photo © Andrew Hunt