So just like independent book stores they will be non existent in about 10-15 years, got it.
Amazon has better prices and selection (and with prime typically two days to get an item at most), and the majority of gamers/releases are going digital anyway. Another option is drivethrurpg...
They don't make any appreciable amount of money. They really are an outdated/minimal value relic of retail, much like physical media and Best buys. There's no point to them anymore.