We actually have D-Mart and they are quite huge but not comparable to Walmart. These are present at multiple locations in tier-1 cities but are hardly present in tier-2 cities. The thing is even though these are very popular they are not shutting down local shops in the region that they are located. The sheer demand is so high that people get things from local shops instead of standing in long queues at D-mart.

To answer your question, yes Walmart can happen but it has to be ready for some serious competition because other than D-mart other big player JioMart backed by Reliance has entered this space recently.