For the aspirational migrant, rich or poor, Gurgaon is the Millennium City, with its sleek malls, sky-scraping condominiums, safe and gracious gated colonies, tenement housing, and life-changing jobs. For corporations, it is the Mecca of opportunity, as countless Fortune 500 companies have flocked to its business towers and parks, at once spacious, elegant and convenient for doing business. For its older residents, a more intriguing fate could not...