Now you have a certain percentage of users with encrypted data, and a certain percentage of users that do not. The UK government will not like that. And now Apple has shown that it will not take a stand for privacy it might have to do it to comply.
For example, A 'Personal Recovery Key' could be recorded in a police database. To gain access to 'encrypted' data from Apple, a court order is needed, once they have the encrypted data, they can unencrypt it using the key only they hold.
There's lots of ways to skin a cat.
That's about as secure as not having ADP at all, or worse. If that police database gets compromised, not only my data is accessible to the attackers, but I will be none the wiser about it.
The Key could even be split, say 3 ways. Apple holds 1 piece, the police hold another, and the Courts hold the third, all three would be needed to decrypt the data.
This is too far in to the weeds though.
It is not beyond humanities ability to have a system as secure as ADP while still providing a mechanism to access terrorists phones for example.