I think you are living in dream world.
Yes, ABM will stop 90%-99% BM with nuke warhead. I already said worst case, It will stop 80%. But that 80% will destroy whole Pakistan.
When you repeat same kind of threat everyday, It loses it's important and counter-strategy comes in picture.
I don't think, There is any way to breach ABM, otherwise we won't invest so much of money. Mirv, Marv, Multiple launch at same time are covered by ABM. One ABM doesn't mean 1 Anti Ballistic missile. But There are 3 layers of shield with 2 Missiles each. So, You can launch 100 Missiles at same time, But we can stop that.
If still doubt, Then Launch after 2014 and let see what happens. 80% or 99%, In both cases - Total destruction for Pakistan.