Wither the Parking Attendant?

There’s very little detail in this article about parking at a Dallas stadium, but the last line is pretty clear:

Last week American Airlines Center, home to the Dallas Mavericks and the Dallas Stars, announced its partnership with ParkHub.com to roll out a mobile program allowing fans to validate all pre-purchased parking with their credit cards. […]

Unfortunately, much of the revenue potential may come from cutting the jobs of parking attendants.

This matches my experience at Sioux Falls airport. Where you used to have every lane manned by a human, now every lane is a machine, except for a lone human overseer that intervenes only when there’s a problem with the machines.