What you say seems very Unique, and could be useful to others as well.
But in this times of internet, the purpose of online booking will be defeated , if every train adopts this idea...
And , as far as I know, Agents are the first to make use of this unique idea, they just press into service their 'man power' to go to PRS, of course through "Mobile Cartel' say agent A is in Bangalore and agent B is in Chennai, A will request B to help him out with...
more... Chennai trains, and B will request A to help him with Bangalore trains...
So in times of emergencies, Common people or AAM aadmi will find this suffocating....