Some people will be more receptive to new forms of payment which are more convenient and some will not. Some won't trust it, and some will. I still see people use cash to pay for bread even though they are scanning their membership using the app. It's not like they don't have the technical knowhow to use a phone. Some people will only charge their Octopus by cash. Some like credit cards.
I like the convenience of being cashless. And using services like Payme or Alipay HK which are accepted at places even if they don't even take octopus and small transactions. Of course have credit card for larger transactions and nicer restaurants. And I know when I'm spending money, it's when I'm buying stuff LOL. The only true way to spend less is to not buy anything, cuz once you start that cycle you only keep buying more and more.