technology looking for a problem
NFC isn't a technology looking for a problem, it has loads of uses. Pay by bonk from a phone is not one of them.
The main use for NFC is to initiate pairing with other devices. This link can then be used to play music over wireless speakers, transfer files between phones or anything else you can think of.
People need to stop pursuing the pay by bonk concept, it's not convenient to have to
1. Unlock your phone
2. Open your pay by bonk app
3. enter a pin for the pay by bonk app
4. choose the virtual card you wish to pay by
all to make a "quick" payment, imagine trying to do that at the M6 toll booth with a queue of cars behind you.