Comparing the new IIMs with the IIM ABC is rather ridiculous and not justified. Considering factors like infrastructure, faculty, and alumni base, the top IIMs are way ahead of the new ones. Even if the new IIMs tackle the infrastructure and faculty issue they can never match the extraordinarily strong alumni base of the older IIMs. The IIMs A, B, and C have given birth to many geniuses that have contributed largely to Indian society in various fields like arts, literature, sports, etc. They have even made impressions globally.
No matter how fast the new IIMs climb up the ladder and excel, they will never be able to match the alumni base and worth of older IIMs.