Ha ha ha ha ha.
No.
Self-serve attendant is one of the jobs I do at work. The ratio is 1 attendant to 6 stations, not “dozens”. Unless you want rampant theft through the self-serve (which, presumably, Wal-Mart tolerates given they are entirely self-serve right now, unlike my place of employment). And you’d be surprised how many people are NOT capable of checking themselves out. And people STILL try to use cash at the machines clearly labeled and set aside as “card only”.
In theory you’re correct but in practice it’s a mess.