Obviously the specific implementation of accessibility within private home-front businesses is a complicated issue. However, I find your suggested solution of excluding disabled people from accessing small local shops rather asinine, especially considering how particularly beneficial such shops would be.

I am not here to debate or offer specific solutions, but I want to encourage able bodied folks to take the following axiom into account when discussing accessibility.

disregarding material constraints, disabled people should be able to access public spaces and attend public events.