You forgot to also ask, how many Americans actually want to immigrate to India? I'll answer that for you since you seem to have more questions than answers: close to zero.
Out of curiosity I looked into the numbers for this. As of 2017, there were 700,000 Americans in India. As of 2018, there were 4.2 million Indians in the US. Dividing by population, that means ~0.2% of Americans are in India and ~0.3% of Indians are in America.