God's justice in damnation

I'm going to comment on this assertion, by a Barthian universalist:

So it is very much incompatible with God’s goodness to create a world in which everyone is damned. 

http://acthe.wordpress.com/2014/01/17/the-goodness-of-god-and-the-damnation-of-all/

i) Universal damnation is just a hypothetical limiting-case to make the point that if God is just in damning everyone, then God is just in damning anyone.

ii) As I pointed out in a previous post, Nemes artificially opposes divine goodness to divine justice.

iii) What I'd say is that universal damnation is incompatible, not with God's goodness or justice but with his wisdom. On the face of it, it would be pointless for God to create a world in which everyone is damned. Who benefits from that scenario? Not God and not the damned. Yet those are the only two parties on that scenario.