I doubt they can ever be able to eliminate cash. Its needed for small transactions, buying a used car, and auctions etc. And don’t have to worry about hacking. As for planned slavery? Maybe that already happened. Since Henry Fords day, one worker per family was the normal thing.
Now, most families need two slaves or bread winners to support themselves and the bloated gov’ts tax pigs. TPTB have hit a BRICK wall. General wages of taxpayers are too low. There will never be three spouses for bread winners. They can’t get blood from a stone.
Besides that, slaves need support, just like before 1850. TPTB and their taxpayers can’t afford to support too many slaves. I still think the grand plan has to be go back to basics.