No, mate. India has diplomatic, economic, political and military options(overt, covert and nuclear). And any overt attack will be retaliated with a combination of them. India's diplomatic, economic and political response could be as lethal as military, mate.
Let me give you an example, very crude, but suffices for the occasion:
Coke does business in both Pakistan and India, right. India says that because you do business in/with Pakistan, we wont allow you to do business with/in India. If you want to work in/with India, then stop your business in Pakistan. Guess, what Coke will do?
Now, multiply this and imagine what will happen if this option is laid out before most non-pakistani MNC working in India and Pakistan.
This is one of the many economic options before India. There are several such options that India can use to punish Pakistan in case of an attack.
BTW, only fanboys can come up with such simplistic solution, obviously PA is more intelligent and will not do any such stupid acts.