JWO hasn’t shut down. The system got polished enough for them to sell it to other companies, so they don’t need their own test-platform locations anymore.

JWO and similar systems do not reduce labor. The people working cashier become customer service attendants. These systems are valuable when the issue is throughput and sales are being lost at peak times. Airport convenience stores and stadium concession stands, for example, can get significantly higher revenue for the same footprint.