Maybe they should try get around the restrictions somehow. If they wont let them use cash maybe they could use some sort of codes or vouchers that can be redeemed for cash elsewhere. Seems the banks and dealing with fiat are always the weak links here and they always get stung by rules or regulations.
As far as I have been reading, other exchanges operating in India are still working without problems. Perhaps these exchanges will also be affected soon?
Maybe. I guess they can't take them all down at once or maybe some aren't complying with certain laws etc.