Retail across the board is dwindling and the niche that is videogames stores has been shrinking faster than most other types of retail which is the inevitable consequence of video games content favouring digital-only over physical.
While that doesn't mean the physical market is completely dead, it does call into question whether running a nationwide retail chain is a cost effective way to deal with them when other options like Walmart and other outlets cater to that market already and are doing better by virtue of diversity of products.
I agree. They don't need retail stores, despite how nice an experience that would be for some, it's not required. Strike some deals with existing retail stores (or even Kinko's / FedEx centers) to handle advanced returns and replacements.