Of course. Why not? We could have one for each caste. Then each sub-caste. Then each tribal group. Then each professional group. Then women. Oh, let's not forget the men, which is easy to do nowadays. Oh and then of course hijras. And so on.
But, really, do let's be sensible.
For my invited blog on the subject, please see: http://www.southasianconcern.org/news_and_blog