I really don't see why he wants to trust the entire world with powers. Unless its just to select which ones he'd want for himself since he's become insanly power hungry and just wants to become a god amoung men.
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None of them sparkle!
Sig by Scythe!
It seems to me that the ultimate goal was the same (had someone with powers in Office) ... what's different is how they were going to do it, and who they were going to use
Arthur plan is yet unclear at the moment, but it seems he wants to be the leader regardless of what happens ...
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"When Gotham is ashes, you have my permission to die." -BANE