Line from Hotgi to Gadag is actually fit for running Super Fast trains, as the line is under utilized heavily... They can use it for introducing Long route trains from Hubli and Mysore (Via Hassan ASK) to North India easily by improving connectivity to that region.
Currently YPR BKN/BME, UBL BSB are getting good response from that region. People from Ballari, Hospet, Koppal board these trains at GDG and Bagalkot, Bijapur region also contributes towards good response.