Do the explosive compounds decompose into more or less volatile things with time? Or are they relatively shelf stable and the bulk material has roughly the same potential as when it was dropped?
It's a big reason why ordinance has a shelf life and has to be destroyed once it hits that age.
I doubt anybody would want that in their storage bunkers. It’s worse enough to have munitions that may self-detonate if kept alone, but ones that are designed to do that?
Also, such a system would have to be very robust. It would have to survive impact and explosions around it.
I think this (https://en.wikipedia.org/wiki/Cluster_munition#Unexploded_or...) would be more reliable:
“In the 1980s the Spanish firm Esperanza y Cia developed a 120 mm caliber mortar bomb which contained 21 anti-armor submunitions. What made the 120 mm "Espin" unique was the electrical impact fusing system which totally eliminated dangerous duds. The system operated on a capacitor in each submunition which was charged by a wind generator in the nose of the projectile after being fired. If for whatever reason the electrical fuse fails to function on impact, approximately 5 minutes later the capacitor bleeds out, therefore neutralizing the submunition's electronic fuse system.”
That comes close. You shouldn’t toss unexploded ones in a fire or run around with it to get its fan spinning, but it would make them fairly safe to handle.