There's really not much risk here. They're trying to play the fear card too much. It wasn't long ago when we didn't have smart phones with encryption. It is so recent that even a millenial can remember those days. And was it a world where all criminals were captures, all crimes solved, people were always safe and secure? No! Rates of violent crime were higher. Criminals still figured out how to talk to each other securely without the FBI listening in. We had organized crime operating with impunity for long periods of time, they even figured out how to use encryption.
There's nothing law enforcement can do to put this genie back in the bottle. One simple app to do a pgp style communication and encryption is back no matter how many back doors the manufacturers put in (or get a warrant to get the phone maker to stick on keyloggers, but everyone's going to avoid those phones like the plague once word is out). Use some third party SOCs from outside America as your key dongle on the PC and you can detect tampering and destroy your keys.. There's just no way they can lock this down.
We have some phones locked tight that may or may not contain evidence about crimes. So what?? This is not a disaster. We've never had a time when we could gather all possible evidence, search everywhere we liked, and solve all crimes. Claiming that it's wrong that they can't open up the phones and get the data from them is like whining that the parrot at the crime scene isn't talking.