Tap and go: Sydney has the Opal, but how long will we need it?

By Jacob Saulwick
Updated August 13 2015 - 10:23am, first published August 1 2015 - 2:19pm
 Opal card: it may be losing its shine as technology moves on. Photo: James Alcock
Opal card: it may be losing its shine as technology moves on. Photo: James Alcock