The A380 is designed to fit within the same 80m box that other large aircraft have to fit in and therefore will not cause many problems for airports designed to accommodate the standard box. The main problem is the number of pax they carry. Yes it is big just check out the full scale mock up of the fuselage at Toulouse.
Regarding success or not I believe that answer is already obvious as the A380 is well on the way to being the 2nd most successful commercial preproduction aircraft in history. With a few more orders it will hit this dizzy record by having the second highest order book before the first aircraft gets airborne.
Have a nice day