The Telegraph UK outlined the following graph, showing that non-cash transactions were set to pass cash transactions in 2015 (and they did).
Australia's Financial Review backs this trend up in Australia, suggesting that by 2020 Australia could be a cashless society.
2. New tech means less reliance on physical cards with more reliance on smartphones
With tech like Apple Pay gaining popularity, you can now use your phone to pay directly at a large number of retailers. While most people will still carry their credit cards as a backup, the trend is shifting towards these contactless payment methods.
Also - smart apps such as Stocard allow your to take photos of cards such as loyalty cards, and scan them on your phone at the retailer, meaning you no longer need to hold onto multiple store cards to gain points.
3. Bulky wallets are uncomfortable, hard to carry, and can even be bad for your back