Currently as far as conventional and nuclear superiority over Pakistan goes, India is far ahead of Pakistan then any time in her history. The drive for military indegenisation & modernization has little to do with Pakistan and more to do with India's bigger adversary China. You cannot fight China with a few fancy weapons brought from US. You need a robust military industrial complex to take on China. Regardless of how long it takes, it is a strategic and economic necessity. Question is, how is the US going to accommodate itself towards this strategic goal? Is the US willing to be an equal partner in military and technological cooperation with India or is it going to treat India as just another client state like Saudi Arabia? That is a question US will have to answer for herself. India will be going ahead with her strategic objectives one way or another. And where possible India will be expediting weapon procurement policies from whatever sources available to fill in immediate gaps but with indeginisation (alongside foreign JVs) still being the ultimate goal.
Besides you don't seriously think India would be so naive to put all her eggs in American basket and pray that US picks India's side and not pull the plug during a conflict with Pakistan? It has happened before. And Pakistan is still America's ally.
Control of Pakistan’s water resources and the waging of “covert low intensity war” by proxy against Pakistan contributes to her paranoia and spurs her continuing nuclear build up. Think it through: is it in India’s national interest to agitate a paranoid, unstable, nuclear armed neighbor? And, from Pakistan’s perspective, was the Mumbai attack part of a legitimate response to India’s provocations?