Encryption isn't privacy.
Encryption isn't everything and all privacy.
But encryption is part of the solution, as much as Tor, etc.
your communications are going to be monitored without a warrant so they will be able to monitor all your associations, purchases, communications and movement and locations. Basically it is like having a tail on 24x7 with someone looking over your shoulder...
Perfect privacy will require several component. Encryption is one of the them. Connection obfuscation like Tor is another. Relying on pseudonymous identities (Do Not Track Me single-use email addresses, for example) is yet another.
then you are past the point where encryption will mean much since they can put a keylogger on your system or maybe even break your 256 bit encryption.
the 256 bits encryption is safe. the actual maths behind it have been repeatedly proven to be sound and secure.
getting the password stolen (keylogger, side channel, implementation bugs, etc.), on the other hand is likely to be what will happen. (and as both software and hardware is shown to be backdoored, they won't even need the effort of puting an new keylogger, just use the backdoors).
The only protection from the surveillance state is either to eliminate communications technology altogether or to return to the rule of law.
In the mean time, you can also make the surveillance job as difficult and expensive as possible.
Thus: encrypt and obfuscate as much as possible, even for trivial everyday activities.