Ok, listen, I've found a way to receive messages without encryption in Miranda again! Looks like the trick is in identifyer again.
Since we still can receive messages from iPhone users, I thought that there is no such encryption in iOS client, so, if the server thinks that we are iPhone users, it will send us unencrypted messages.
There is an option to manually input resource (whatsapp client version) in pidgin. I have tried to input "iOS-2.12.12" (perhaps other values will work, I did't test), asked my friend on android to send me a message and received it unencrypted! After that I exited whatsapp in pidgin and turned it on in Miranda, and received a message from my friend on android unencrypted again.
It means that we can still use whatsapp without axolotl encryption if we set the right resourse. Can anybody confirm it?
I understand that it is just a matter of time when all the official clients will use the encryption, and the resource change won't help soon. But it's better than nothing for now.