While I agree on America boots on Indian ground part, I do agree that alliance with USA will cost us some major re-writing of our foreign policy. That said, it is a very small price to pay for ensuring that we have quality weapons and an alliance to collectively fight China. If India can hammer out a good treaty that is. I do not agree that India and US can be "Equal" partners, the relation will be unequal. But a multi-lateral alliance will ensure that such differences are amortized.And why are we getting in the circlejerk of American boots on Indian grounds. The whole objective of the alliance should be to take as much tech and introduce it in our economy and military. We don't need the Americans to fight our wars we only need American tech. We have 1.3 billion people to fight our wars. The whole objective of quad is the have equal partners who maintain Freedom of navigation in the high seas. And Trump is similarly less intrusive in internal matters compared to the previous regimes of bush and Clinton dynasty. You are being too pessimistic just for the sake of it.
If US does not holds up to its promise of treaty during a conflict with China, it will also impact other parties (like Japan, Australia, Taiwan) of the alliance.