Knowing what Indian Media is like I would rather not want this to be debated. Given Nilekani is heading it and the fact that the government is actively working to bring in any relevant person or advise I would assume they would do a good job of analysis the pros and cons and the feasibility of it in a country like India.
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.