The 380 cannot be compared to Concorde with needed absurdly high prices to be paid as premium for speed . It is a great plane to fly on-streets ahead of the T7 in terms of comfort and potentially it will retain this vis a vis the 78 and A 350 which are no doubt very economic but seem to be a bit underwhelming in pax experience and likely to end up very crowded due to more seats abreast than the airframe was really designed for.
I think carriers like BA LH AF etc will gradually add 380s but that more growth will come from the ME3 plus high density versions which will be necessary for several China services in 4-8 years time.
So I think it will be better than a lemon but no A320 either and its definitely my aircraft of choice on long haul since it is very quiet and very comfortable and doesn't force you to breathe air with 5% humidity