I don´t want to enter the debate whether inerting is reasonable or not...
But when it comes to the A380, this aircraft should be "safe" of this system: The Air Generation Units will be located -forward- of the -wing- tanks; and on the passenger aircraft, there won´t even be a centre tank, let alone a heated one.
FedEx (and EK?) has ordered freighters, yes. But then again: No "heated" centre wing tank...
I guess they´ll have to find another way to slow down the A380...
J.V.