Whoever came up with this idea is not aware of things and is being simplistic. This is a diplomatic issue which pakistan has to fight diplomatically. Military option is not a solution to all problems. If Talwar(sword) is used in the place of sui(needle), then the results will be disasterous.
If Pakistan bombs even one dam of India. First and foremost, there would be floods in Punjab. Huge amount of people would lose lives and property worth lakhs(or even crores) would be lost. India will portray Pakistan as a rogue nation that has lost control. World will be sympathetic to India. India can then successfully get Pakistan to be sanctioned in several ways. There are would be covert retaliations within Pakistan. People would be suffering, and they will not be happy with this move of Pakistan. In short, everyone blames Pakistan including Pakistanis. All for what? A dam, which can always be rebuilt.
Instead, Pakistan, if possible should use diplomacy to get the work done.
Anyway, from Indian's POV, I am pleased. IWT is just cool. India has used this treaty well. Now, India has the capability to create both famine and floods in Punjab. India can use this leverage.