The problem with going cashless is that not many people will be able to embrace it. in the advanced countries this may not be such a big deal as nearly everyone is already familiar with all sort of technology and buying online in a cashless manner. in the developing countries with high number of uneducated people, this can be a very big issue, it will require teaching almost everyone on how to operate an internet enabled device and own one as well.
Going completely cashless will pose a lot of challenges to many people which i doubt the governments are ready to subject its citizens to. So this is not advisable best thing for now is operate in both ways
Agreed. Even the first world countries there are still a lot of people who aren't tech savvy to understand the complexity of a cashless transactions.
How much more on the 3rd world countries. Both would co-exist and as time passes by cashless transactions might become the most preferred one than paying on cash, but cash won't just disappear, both would still co-exist.