I can't see how India is going to afford this. As stated in another comment it could cost up to $800B dollars, which is 30% of India's GDP. If this causes India to have financial issues as a country, it's their own fault for not doing basic accounting and number crunching.
That's like saying if everyone maxes out their health insurance, insurance companies will go out of business. In any given year, not everyone is going to use the ~$8000 allocated to them. Also, healthcare in India is cheap. $8000 goes a long way.
Yeah I think ₹5 lakh is excessive. I have a ₹2 lakh cover for me and my wife and unless we both are diagnosed with bone cancer simultaneously we are in no danger of maxing it out.