Perhaps you are not aware but cost is already being exacted.
Pakistan got Indus Water Treat due to Indian magnanimity.
It was the only treaty of its kind in the world between two adversarial nations, where an upper rippaerean nation voluntarily gave away 80 percent of water to a lower rippaerean nation, to which it has no obligations too.
India never broke or withdrew from the treaty even when Pakistani launched wars against India.
That has come to an end!
Nonsense. There was no Indian 'magnanimity' and such claims show your arrogance and stupidity. The Indus does not flow by your permission. It has and will continue to sustain our civilization till the end of time, by the Magnanimity and Grace of God Almighty alone.
In retrospect, it was the Pakistani negotiators who showed great flexibility to IWT in their approach and made decisions based on the moral imperative of water being a human right. For example, despite being under no obligation or legal precedent, they allowed India to take 3.6 MAF water for local use within Kashmir, as they believed it necessary for the future water security of the people of Kashmir. They also conceded the eastern rivers despite there being little to no land under cultivation in Rajasthan back then, with the understanding that Pakistan would then build Tarbela Dam to ensure the continued supply of water to Bahawalpur/South Punjab, which historically had already been under cultivation since time immemorial, and was the most affected by reduction of water in Sutlej. These concessions from Pak are the only reason why IWT has stood the test of time. Not any supposed Indian magnanimity.
But our negotiators back in the 50s did not foresee that India would instead subvert the 3.6 MAF provision to plan almost 60 dams, not for the benefit or water security of local Kashmiris, but as a tactic of coercion against Pakistan. In fact, even before Modi suspended IWT, practically India has been violating every aspect of it both in letter and spirit, utilizing much more than the stipulated 3.6 MAF, and delaying water release during Rabi sowing season, whenever technically possible.
PS: it is laughable that you folks still call yourselves "Indians", while having zero affinity or association with the Indus beyond using it as a tool of coercion. Jinnah told you not to use this name for your own good. But I personally don't mind. Because this identity only reinforces the fact that you were culturally, militarily and economically dominated by the people of the Indus Valley for close to a millennium, during what is universally accepted as the golden age of India. Of course you Sanghis are now trying to re-write your history because this idea is intolerable to you. But the fact is your language, your arts, your architectural symbols - everything you put on those colorful marketing posters for "Shining India" - in short the whole syncretic culture - is a product of what the people of the Indus contributed to the subcontinent. The Indus is not a tap. It's the life blood of an idea. That is what it really means to be "Indian".