I'm not sure I completely agree. I wouldn't go through all the trouble to build a clone site when we're close to seeing the AUG as you said, but not because it will upset FFG. What you're saying makes FFG sound like an abusive authority figure who is making decisions based on how pissed off it gets. I hardly think that's the case.
What putting up clone sites does is show them that we are unwilling to accept the current situation. Streaming music services probably wouldn't exist if no one had pirated a single MP3 and had just kept buying CDs in the early 2000's. Instead, the rampant piracy showed the recording industry that it had to adapt to the public desire for a different content delivery system or die out. Of course, that is a gross oversimplification of that situation, but my point is, sometimes you don't just vote with your dollars, you make your point with your (non-violent) disobedience. FFG is smart, they aren't going to declare all-out war on fansites, and they've probably already seen the effects of this first C&D business.