The ICC was a good idea in principle, but the moment the worlds major powers refused to join it it became absolutely useless.  The concept of inducing national leaders to ratify and sign onto something that may one day prosecute them is like waiting around to see unicorns.  States that have nothing to fear from the court have no reason to join it, and states that have human rights issues who have everything to fear - wont.

Close it up and spend the money on enhancing the judicial systems in problematic countries so they can do the prosecutions themselves.