You can make a case out of everything and anything here in India, its just that it will take 20years to get that case solved .
Also I don't think there are enough bitcoin sports book that can handle the amount of bets that are made in India. People wager like 50BTC/2IPL matches with their "local" bookie. I wonder how would the sportsbook handle Indians if most of them come online.
I think yes that would be one limitation, but again , like someone said, the big players would probably not use bitcoin, and mostly don't do so even internationally.
The max you can bet on certain sites to win is around 50 BTC, which is around 12K $ .
It is a question of the market developing.
Once the bets being made using bitcoin become larger, sites will start developing the capability.