Did you know that the Ganga & Kaveri rivers are connected? ... by Mysore Varanasi Express - Vishwanath Joshi

Passengers from Katwa and Azimganj don't care much about reserved trains. The only good reserved passengers come from Nabadwip and Khagraghat for Bdc-AZ section. Khagraghat can have some passengers as it's like a substitute for Bhagirathi exp which is always crowded. But, Nabadwip already has many options for Kolkata.
The BAK loop and the Lalgola route mainly have passengers who travel at the lowest fare. That's why when some passenger trains were changed to exp, there were violent protests in both of these routes. Actually, in the Lalgola route, people even threw stones at the trains.
If it's a lower fare train, then for sure more people will use it and it will become popular.