This is conjecture, all renowned PSU experts have already made their case. ATX 3.0 has no bearing on this (potential) mechanical failure, hence, having an ATX 3.0 PSU will not change anything.
Anyone who owns a high-quality power supply does not need to replace theirs, especially at the ultra high end. No PSUs that advertise 3.0 support have even come close to outperforming models like the Corsair AXi series.
The problem is taking WCCF seriously to begin with.
and I'll side with whatever Jon and Aris have to say, every time.