To be fair, the Wikipedia sites for these languages barely have any content. Of those that do exist most articles are essentially 2-line blurbs. These languages are essentially dead for all practical purposes.
A large fraction of Indian children will be illiterate in these "thriving" languages in the coming decades, with "zero" monetary loss. Not living is death, and they haven't been alive for a long time - I can neither get any Govt. services in my mother tongues, nor can get the laws done by the colonial state in Delhi.
A zombie is not alive IMO. If Indians wish to parlay their tongues for money, it's upto them. I for one will not deceive myself. We are going to be part of the borg that is the Anglosphere in less than 3-4 generations.
Regardless, dead has a specific meaning for languages and if people speak it(especially hundreds of millions of people) then it is not dead
Do you think gnipgnip believes something that isn't true, or do you think they're just using words differently to how you'd use them?
For much large part of Mughal period the court language was Farsi, but Hindi/Urdu survived, you are underestimating the ability of people to straddle multiple languages. For many Indians its just a necessity.