It's not only can be done in theory, it's already implemented in both TOR and I2...

		SXX on Dec 2, 2015 \| parent \| context \| favorite \| on: Kazakhstan to MitM all HTTPS traffic starting Jan ... It's not only can be done in theory, it's already implemented in both TOR and I2P. You can't MITM traffic when it's encrypted end2end. Issue is that cryptography won't help when there is some government that decide to enforce censorship country-wide.