Don't forget there will always be a big market for big aeroplanes. The 747s of all models cannot go on forever, and the premium operators will be looking for the replacements. Already the 747-200s are heavily retired. The 400s have been in for some 16(?) years which means the heaviest used ones are looking at retirement. The 747 retirement market alone will keep the 380 market healthy. The 747 is old now- its orders will never recover.
The Far East market will suck up all the 380s Airbus can produce. Even Emirates thinks it can use 38! When Qantas, BA, LH & AF finally order what they need, the production line will go on forever!