Imagine game theory implications of all countries agreeing to something like this, monitoring to make sure they actually do this and eventual fraud that will take place. No thank you.
That's yes thank you from me - the game-theoretic implications of such scenario being successfully pulled off, would allow us to solve climate change and poverty and peace next.
Mutual consensus among multiple - say, at least 5 - nations chosen for maximum mutual hostility, that leads to proportional reduction of military spending by sum of 10% of world's total military spending, done honestly and in a way that doesn't alter the balance of power.
I.e. the kind of coordination game theory decrees as effectively impossible. Were such event to happen, whatever mechanism drove it could be used to reduce emissions and implement effective climate change mitigations pretty much on the spot. And if it generalizes as solution to coordination problems, it would literally solve all major issues plaguing humanity to date.
What if we could all just teleport anywhere we wanted at any time, instantly!? Like most things of this sort, unfortunately, we exist in the real world where such a naive fantasy will stay as just that; a naive fantasy.
Is it so naive to believe that eventually, we as humans can eventually overcome our stone age instincts and stop slaughtering each other on a big enough scale to necessitate some amount of militarism?
I for one would be greatly disappointed if we could not achieve that eventually. In today's age, I agree that it's hardly possible, there are simply too many parts of the world without sufficient education or still in the grip of authoritarianism or religious fanatics, but once we've overcome that, it should surely be possible eventually?
... eh, maybe I'm just naive. But as MLK so nicely put it, the arc of the moral universe is long, but it bends towards justice, and I'd really like to believe that.
