Any move away from cash and the dependence on cards and tech various is simply the inevitable result of Bank and Govt manipulation to archive whatever agenda it is that are looking to achieve. Much the same as encouraging if not forcing people to bank 'digitally' then using the drop in face to face branch business as the perfect excuse to close branches and dispose of staff.
No conspiracy theories per se, it's just all about the do$h ... but most definitely theirs and not yours 
No cash = no jobs done 'for cash' avoiding tax. China's underground economy is massive, they are missing out on tons of tax so clamped down on crypto and are squeezing cash.
Private sector fewer staff required = more potential profit for retailers.
No cash = banks need fewer branches.
A bunch of things that used to be done in person aren't now. This is the way things are. Automation is a thing and is needed to ensure longer term competitiveness internationally. Global Britain and all that.
How the benefits of this are split and what's done to ensure it doesn't harm people are a very different story though.
I think people seem to forget that cash is nothing more than a promissory note from its issuing bank. You pay it into a private bank someone taps numbers on a keyboard and credits your account. The note itself has no more value than the numbers in your bank account besides who backs it.
Actual hard currency stopped being a thing when the UK left the gold standard. It's all promises to pay and numbers in a computer. Cash is in many respects a relic. I'm fine with it disappearing as long as appropriate regulations are in place to ensure our transactions aren't enriching Visa, Mastercard, AmEx and our banks and that financial data isn't misused. Keeping and building on GDPR would be a good start.