Latest news is Gerard Darmanin, french minister of the interior, is trying to use the latest attack in a french school to ban encryption or at least force encrypted messaging vendors to add backdoors for governments: https://www.numerama.com/tech/1533652-attaque-a-arras-darman...
Right. If everyone hides in encryption, they'll outlaw encryption.
If they actually want to catch all crime, the only way to do it is mass physical surveillance, either with laser microphones Van Eck phreaking, or with smart-dust and the like. These technologies aren't limited to just government surveillance, so I've been saying for ages now to anyone who will listen that we need to massively alter our "common sense" attitudes to crime and punishment before organised crime starts using it to automate mass-scale blackmail: a judge or a police officer snorting cocaine would be demonstrating poor judgement just to perform the act, let alone as a result of the drug itself, but society is much worse off if a mafia records them doing it so they can get their people off the hook for bigger crimes.
And no, governments can't just use such surveillance to arrest everyone who breaks the laws: my go-to example of this is heroin in the UK, because as far as I can tell nobody defends heroin, yet enough people use it (200k) that fully enforcing the "no possession" law for that substance alone and nothing else would nearly triple the current UK prison population (95k, though I'm assuming that at most only a small percentage of them are currently getting heroin into their prison).
I don't know what the best way to approach things like this would be, only that it's not going to be an easy thing that can fit into a comment box — the best I can do is say that my vibe is instant-and-tiny penalties, so a speeding offence might be £0.1/minute/(MPH over the speed limit)/(thousand pounds of monthly disposable income) or something like that.