Yes i am using BSNL ADSL broadband at my shop. I don't need crazy speeds, as i mainly use it for professional purpose rather than streaming or gaming. BSNL provides upto 20mbps speed on ADSL in my area which is more than enough for my needs. I am on the Superstar 300 plan @ ₹749+gst, which offers 300gb hi-speed data and then unlimited at 2mbps, unlimited calls to any network, and Hotstar Premium subscription. That caters my needs more than enough.
The same plan is also available on fiber at same price point and benefits, with only difference being the speed. On ADSL it offers upto 20mbps and on fiber they provide upto 50mbps. But as i said, since there isn't a need for high speed i never cared to switch. Service quality is also very good which is another reason i didn't switch. But then, i took the connection 4yrs ago.
ADSL will remain in market until fiber reaches all the areas in the country. Maybe the operators slowly withdraw the ADSL service like they are doing with the 3g and 2g mobile services. But yes, fiber is the future. If i have to buy a broadband today, i would prefer to get a fiber rather than ADSL.