If we see the industry report published by EY:
ey-future-of-pay-report.pdf , we clearly see that wages are growing in India, so is per capita income. I agree that economy is not good but not all sectors are affected the same. Jobs are being outsourced from western countries to India.
Coming to Air Traffic in India the trend says that as mentioned in the link
India's air passenger traffic likely to increase to 827 mn by 2032-33 (business-standard.com) it is going to increase by leaps and bounds even after revenge tourism comes down. As I have said there will foreign travellers too.
For argument's sake lets assume flight prices are going up faster than wages and lesser people can afford air travel, won't it solve the lounge problem then that only people with super premium cards will travel. Maybe banks are waiting for this event, so that they can still advertise lounge access knowing people can't utilise it.
Bangalore has built a second terminal, hyderabad is proposing one, so yeah there might be space crunch but there is still scope for expansion. If India has to truly become a transit hub it need to solve for the air traffic problem.