IF Boeing were to stop any new production of the 747 today, there would still be 747s in mainline service 30 years from now.
I will be mighty surprised if I ever see tha last passenger flight of a 747.
As for the question of the A380, there is a seperate thread for that question. I did just hear, however, that LH is defering their A380 order. As well as their orders for more 747-400s.
The day you stop learning is the day you should die.