I really doubt if that problem will ever be tackled. In cities it is a logistical problem. Standing in line for 5 minutes for a proper toilet v/s shitting on a track right away. There is no way on earth we can build sufficient number of toilets for the people in Mulund or Dharavi slums. There are politically incorrect solutions such as letting people defecate in open but provide slightly better facilities which will help tackle all the shit.

In village however the problem is purely cultural. I worked with some NGO which build proper flush toilets but people would prefer to use them as goat shelters. Their priorities are different.