I think this train can be Extended to either of the stations Kanpur/BSB/MGS/ALD as it would facilitate passengers from Himachal (Manali,Shimla) to get an alternate to Patna/Howrah from tha aboce mentioned destinations.
The train 2311/2312 is real Fill-Up train in season time and it will be toughest to get reservations confirmed in any classes with Huge WL's.