Things have to start - we cannot keep debating. I understand revising or doing it again is costly in India. But whatever the current investment into this pays of in just one use of this - ensuring the facilities are not misused. I bet there is more money people are shelling out in bribes as a whole to misuse than what is required to prevent it. One investment of govt I would not complain about even if I have to pay a nominal fee for it or raise funds.
While there are some instances where a govt has resisted the temptation to use technology to its fullest for its own interests, the majority are limited only by their competence.
It will be used for tracking because it can be used for tracking and that's one thing that govt folk like to do.