I lurk around in Reddit and see lots of young folks just starting to get into "better audio". They inherit stuff from grandpa, or are scouring thrift shops and end up not happy or not knowing how to improve their sound. Some of these people thing they have scored a big find with the black plastic department store systems - they need some gentle exposure to real gear.
There are also a bunch of new vinyl fans who only have a bluetooth turntable and powered speakers who wonder how much better an integrated amp (or some old overpriced "silver face" receiver) will make their system sound.
I guess this would lead me to think a store that has reconditioned, or can recondition used equipment, merged with some streamers and quality entry level components could find a niche. I'm not sure about on line stealing your sales, but if you stick to MAP products would that help?
I'm thinking that the majority of us boomers are happy with our systems, or having to downsize and give away our extra stuff to family - not spending a ton cash So maybe cater to the younger demo who spend a lot of time at home gaming, watching movies, and listening to music at their work from home desks.