Like you said, this is very much on the lines of the US/UK govt claiming encryption as the culprit for everything. There would have been a push for this anyway, irrespective of whether the Paris attacks had happened or not.
The implementation would likely be forced at ISP level, blocking known Tor nodes. But then, Tor is larger than that.
Interestingly, we had a discussion on this at the Rust 1.0 release party in Bangalore. One of the participants said he was working with Rust on embedded devices, and have been trying to use Rust with OpenWRT.
The implementation would likely be forced at ISP level, blocking known Tor nodes. But then, Tor is larger than that.