Bill Gates in past has supported horrible centralized mechanisms like Common Core. People like Bill Gates do not fully understand countries like India and their knowledge solely comes from "Intellectual Yet Idiots"[1].
Certainly. It's a free country after all. There's already an army of "critics" in Indian Supreme Court who want Aadhar to be thrown into the bin under Article 21.
It won't happen any time soon or even ever. There are already talks of a Universal Basic Income by two major parties. They need this kind of infrastructure to roll out their scheme soon.
In short it will be mostly activist rage on Twitter, and beyond that nothing much actually.
More over Azure is the cloud storage provider for all govt data moving forward.
So not only Billgates would support Aadhaar, NSA & every party benefiting out of privacy abuse would.