Couldn't agree more. It's madness. You're still in uniform, alert for noises, failures. To say you're off-duty, resting like your colleagues back home is just corporate greed.
Wasn't there an Emirates 380 a couple of months ago routing West Coast USA to Dubai that had to stop off somewhere in North America/Canada with a tech problem? Total travel time was something like 22-23hrs solely because they had 2 crews on board.
Unfortunately, I think it'll just be seen by the various European CAA's/EASA as a hidden issue that the public don't know about or even comprehend. When a crash happens, the spin will be one of, 'they were all rested, within limits, everything above board, etc'