The brick-and-mortar retail world has been transitioning to an on-line purchase and delivery model for well over 10 years now. There are many things that Barack Obama can and should be blamed for, but this is not one of them.
The old business model was necessarily inefficient, requiring excess inventory, transportation, labor, over-processing and energy expenses, in relation to the newly-dominant Amazon online retail model.
What Obama and his socialist minions deserve blame for is maintaining a governmental regime of high taxes, excessive regulation, poor public education and open hostility to entrepreneurship that have created huge barriers to entry for new American businesses.