Oakape,
No probs.
My discussion on Altitude capability of the A380 was purely to do with a commercial question of how many pax we are carrying. It can still climb and carry lots of pax.
As an aside, you can lose 2 engines or depress and still stay well above man portable sams. Just because you depress doesn't mean you go down to 14,000 straight away. Plenty of oxygen to stay high enough. Depress profiles for the HKG-LHR sector are examples (though they are for terrain).
There will have to be long hard thinking as to how long commercial traffic will be able to transit conflict zones though - I'm sure ISIS would love to get their hands on the appropriate toys, and the capability of simpler sam systems is sure to improve.
N