In fact, 99.97% of those who have Aadhaar, used existing identity cards and proof of address to get it. According to a reply to an Right to Information request, UIDAI replied that only 0.03% of those who have the Aadhaar number got Aadhaar without showing two existing proofs of identity and address.
As far as closed doors are concerned, Aadhaar does not guarantee any benefits: work through NREGA, widow or old-age pensions or ration foodgrains. There are separate eligibility conditions for those programmes which continue to apply.