I don't think that would be the case. If a couple of western Governments "ban encryption" it would probably just mean that they weaken the crypto (e.g. backdoor). The traffic of weakened crypto still looks the same as the traffic of strong crypto - I don't think it would make strong crypto any more noticeable.
Also remember that crypto would still be legal in the rest of the world (China is not going to backdoor their crypto for the NSA's benefit) so you would still have heaps of encrypted traffic moving across the internet. I doubt that such a measure would do anything but make mass surveillance of western populations easier.
Also remember that crypto would still be legal in the rest of the world (China is not going to backdoor their crypto for the NSA's benefit) so you would still have heaps of encrypted traffic moving across the internet. I doubt that such a measure would do anything but make mass surveillance of western populations easier.