Lets be realistic here for once, the US has so far been the most successful country when it comes down to designing and building military hardware. The amount of resources they can throw human and capital are simply unmatched, you honestly expect India to build a 100% credible ABM for only a fraction of the budget and only a fraction of the expertise, you have to be on some really nice drugs to actually believe that. Its good to be optimistic, but i will be a fool if i believe that i can outrun Bolt in a 100 meter sprint race.
As far as India's ABM capabilities are concerned, i have my doubts about its operational capabilities. Looking at the current state of the Indian Missile Program, i have a hard time believing that in such a short span of time the Indians are going to come up with a missile that can shoot down another maneuvering missile. The amount of testing that is required, the steps that are required, its an incremental process. Anyways, no point in speculating, all our queries will be answered in due time.