Readers interested in a meta-solution to the conflicts in the Middle East could do worse than read my short piece on Peace Bonds. Defining peace in terms robust enough for our purposes might not be easy, but the necessary thinking will help clarify exactly what we want to achieve. As in many other policy areas, there are plenty of statistics already being gathered and with some verification and supplementation a combination of them could be targeted by a Peace Bond regime. See, for instance, this site, for some indicators that we could target.
On another note, David Pilling asks: has GDP outgrown its use? As I have repeatedly posted (here, for instance), the answer is an unqualified yes.