If you catch every road traffic offence, the only people who will still have a licence will be people like me who don't have a car.
If the UK tried to fully enforce its drug laws, it would bankrupt itself with all the extra prisons it would have to build.
Even if the governments of the world don't care to use surveillance tech to catch all criminality, blackmailers will use it because it's already cheap and getting cheaper, which forces the governments to change anyway. (Though perhaps GenAI will get good enough fast enough that any image will be assumed fake by default).
But I really do mean radical decriminalisation (civil law offences are not criminal offences) not merely the illustrations of decriminalising hard drugs and reducing the penalties for speeding.