A weak pakistan is both good and bad for india. Good in the long run since a weak economy will prevent pakistan from projecting power. but bad in the short term because there will be the possibility of more terrorists.
I doubt India wants to project even the slightest inclination of involvement in Pakistan. The reality behind the scenes I’m sure is quite different.
India is scared of Paki’s nukes falling into the hands of the Taliban, pure and simple.
Don’t forget about China. China is an ally of Pakistan, and will become even more of an ally in the future. We will become closer to India. China is troubled by the warming between India and the US, and an unstable Pakistan is a thorn in the side of India, much like North Korea is to South Korea.