The fact is....
The ABL is only useful if your enemy is kind enough to tell you when and where the will launch a nuke at you,,,, and you have to asssume they are willing to nuke you, but unwilling to shoot your slow flying plane.... it is cool, but a waste of money
Can it kill a missile, from what I have heard "definitely" but can it be there at the right time and place? VERY unlikely......We all want a simple fix....I am sorry but the ABL isnt it....