A cashless society will enslave us, what do you think?

Well it'd mean if you commit a crime or do something the government doesn't like, in the worst case being "thought" crime, they could stop you from being able to feed yourself by just invalidating your card/chip. The dystopia might not be probable but it certainly sets the stage for a malevolent group to make it reality if that were to happen.

Plus, no more cash in hand work or unregulated drugs as payment would be impossible to track without some third party technology or loophole (which there would be).