Called the CC and they said this is only for few circles like Chennai where 10 GB cost is 1.5 k but not for Pune where for example already 10 GB is only Rs. 999. Note I am talking about "data card/home wifi CPE" plans not mobile.
I guess Airtel will respond only in those areas where there is competition with Reliance and others, and not bother in smaller areas where there is less competition. Same situation we see with landline broadband with ACT etc in Bangalore/Hyderabad where BSNL/MTNL respond with better plans but don't bother in places like Pune where there is hardly any competition.
But still I'm hoping in general 4G speeds and data caps will be maintained or improved while reducing the pricing in places like Pune in the near future