It is perfectly possible to have uncrackable encryption with open-source code. What will they do then?
Rubber hose/TASER cryptanalysis ie they put you in a jail cell & then have a couple of guards work you over while falsifying a report on how you got in a fight in the jail.
Bingo.
There are Linux and Android devices that can be encrypted too. Do they think they can force the open source community to implement specific features?? Good luck.