It's time. Adopt technology to alleviate long queues at check outs. Allow existing counters to cater for certain shoppers, but instal automated checkout booths for tech savvy shoppers.
When you have more people adopting the tech, then slowly decrease the old fashioned counters.
Although I still prefer person-to-person interaction, it's just not doable in a megacity. We hardly have time to say hello at check out counters here, due to long queues and exhausted cashiers (who dealt with God-knows-how-many customers per day).
So, when will NTUC (or other shopping malls) implement more self checkout booths all over the country to alleviate long queues?