There maybe a chance to use bitcoin for online gambling but still this depends upon the gambling organizer. But if ever the gambling site is on bitcoin this is a big possibility. Some online gambling might still use other currencies for their own purposes..
Bitcoin is best to use in gambling because you dont have to reveal your real identity.
Yeah , anonymity is the best feature for paying with bitcoin on these gambling sites. Those people who do not want to reveal their identity to the others because of some matter they use bitcoin.