"Retailers need to offer [consumers] tailored product and service solutions and reward them personally," Bird said.
Online's share of shoppers' dollars would continue to grow next year, but bricks-and-mortar stores still had a role to play.
The successful traditional retailers would be those that were "obsessed about customers", Bird said.
"In physical stores you've got to concentrate on delivering a better experience ... they've got to be places where customers want to hang out."
New Zealand Retailers Association chief executive John Albertson said stores could expect another "reasonably tough" year in 2013.
Despite the challenges, he said retailers needed to focus more on improving margins than sales.
"Consumers have been having a wonderful time," Albertson said, and the amount of discounting was having a detrimental impact on firms.
Bricks-and-mortar stores needed to think carefully about how they would attract customers, he said, such as through offering the best possible service.
Bird said traditional retailers could no longer think they were only competing against the shop around the corner.
Thanks to the growth of online, the world had become "one shop" with consumers' expectations, especially around pricing, being increasingly shaped by the internet.
Online shopping in New Zealand was tipped to reach $3.19 billion by the end of 2012 and $5.37 billion by 2016, according to a report by PwC and Frost & Sullivan.