The path...
But that’s the path we’re on now, if we don’t come together to solve this problem.
That problem has been around for a few thousand years and it is only now that they think that they should stop it? Too late, my friend.
Cryptography has been around as long as there have been rivals, whether that is political, military, business or sexual. Most cultures came up with ways of creating encrypted messages that could not be (easily) intercepted. The Enigma machine is probably the best known breakthrough for mass cryptography, although it was flawed and cracked.
Since the advent of the computer such cryptography has been available to anyone who wants it, and if you really want to keep your conversations secret, you don't use a smartphone and a standard app, you use your own communication channel, using a tried and true public domain encryption library to create your messages, then it doesn't matter what medium you use to transfer the message.
Stopping consumer level messaging services from being encrypted (which is essentially what backdooring is, because the backdoor key will be publicly available at some point, soon after it is created) just opens users up to attack and exploitation by criminals. It won't actually stop those criminals, terrorists etc. because they will still be using open sourced / existing secure libraries to mask their conversations.