Market follows what Walmart and Amazon can get to work and Walmart has shown it's quite willing to jump into advancements in their backend before it's been proven cost effective elsewhere. It's how they defeated Kmart in the 90s and they moved their warehouse operations to RFID way before the industry thought it viable. Amazon uses robots all over it's warehouses and can write off an insane amount shoplifting from it's registerless store from how much they save in payroll.