In a sense, those who are advocating piracy are trying to have their cake and eat it too. They may object to using the term "piracy" to describe their actions, but it's still piracy.
The other thing is that if you want to really make a statement that the entertainment industry understands, about the only thing they pay attention to is their sales figures. They'd put static on Blu-Ray disks if they thought people would pay for them.
So, to make that statement in a manner that will raise an eyebrow at a boardroom meeting, you have to stop buying the movies. You have to stop renting the movies, too (so that Netflix and BlockBuster don't buy as many copies).
In short, you have to sacrifice something, and, unless enough people are willing to make that sacrifice, the studios won't pay any attention to your calls for change.
And, really, is this a huge sacrifice to make? Compare the call to boycott Blu-Ray disks to the Civil Rights campaigns. Back in the 60s (sez the geezer), people made real sacrifices - part of the civil disobedience thing was accepting the legal consequences of your actions.
Heaven forbid we forego the most recent Michael Bay flick on Blu-Ray.
A little perspective, please.