It's clear to all
"Irreversible encryption will make it very difficult — maybe even impossible — for law enforcement to obtain evidence, and I am not sure this reality is clear to all."
Yes it is, thanks. Actually, that's the point. It's even more clear in countries with authoritarian regimes and not even the tattered remains of the Magna Carta that we have in the US and UK.
Apparently the AG never read http://tools.ietf.org/html/rfc1984