Would you pirate? Would you vote with your wallet? Would you start a Blackout similar to what was done with BF3? How do you get publishers to take notice?
I'd not pirate, I see pirating as a means to get software for free, which has nothing to do with making any kind of economical or political statement.
As a side note, I've tried piracy on psx, psp, ds and pc. Every time it has the same effect, I get games and do absolutely nothing with them. This is in direct contrast to me buying games, where I complete 95% of them and feel satisfied and a sense of accomplishment, something piracy absolutely fails to give me.
Firstly I vote with my wallet, I'll wait 3+ months and wait for it to be in a steam sale or just generally cheaper at an online retailer. I buy a lot of games these days, but only the really important ones get a chance of being purchased at launch by me.
If I really wanted to get a publisher to take notice, I'd make a well written constructive post somewhere they will see it, forums, twitter, facebook are all options these days.
Once enough of a movement has picked up and some developer reactions/replies have come back then it's time to approach the gaming press in the same calm, constructive manner and hope they've got a dry news day or believe in the cause enough to post an article.