The volume on a per day basis is still below Rs 1 lakh. I  am not using any cash channels, all the business is done through NEFT only.
Though I cannot say that it will be payment gateway in a full sense, merchants in India can now get their customers bitcoins sent to their specific address and the amount will be deposited in their bank accounts daily.

My experience so far is ...the volumes are low....test your ideas...if it not fully automated...make a semi automated setup...but the get service out. the true validator of your business are the customers not the regulatory agencies.