True to some degree, definitely. The rent/demographics/industry trends factors make it tough here.
But I heard that DCCD owned their building. While a warehouse-size Soundgarden type store probably couldn't make it in DC, a well run small indie shop like Spaceboy in Philly or Paul's in Pittsburgh (both around the size of DCCD, but are full of a strong sense of dedicated passion for music and an on-top-of-things stock), in the right location (maybe along U street somewhere?), I believe could make it.