The idea that Walmart will wipeout every corner shop is extremely ridiculous.
In MMR we have D-Marts in every node. D-Mart's are like Walmart but on a comparatively small scale.
It has benefited lots of people from consumers to the people working there and has created many jobs too.
It hasn't wiped out the corner shops.
The only people it has affected are the middlemen and some of their competitors like Reliance fresh, Bharti group's More etc, now these people are already rich.
Thus it benefits more people and especially the working class, so if Walmarts are opened they would be no different but there should be conditions like building local infrastructure and supply chain and source local products more.