Yea, I gotta agree here. It's a neat idea, but I think the petition really needs to be aimed at a promoter first and foremost - nailz is entirely right there, that's how it works. Now, major promoters like Clear Channel aren't exactly known for being responsive, but eh, it's probably more realistic to address them.
I mean hey, just as an example, as much as these two of my favorite artists are friends and collaborators - David Sylvian and King Crimson could not get to tour together due to promoters' financial concerns. They really wanted to, the fans thought it was great, the promoter didn't. Result: promoter wins.
Although I'm sure the petition will at least reveal whether there's at least enough fans to even mildly annoy the promoter, should they decide to put in the real effort...

The Birds are using humanity in order to throw something terrifying at this green pig. And then what happens to us all later, that’s simply not important to them…