I know Hikki is aware that her fans want to see her in concert, but she has stated that if she sees a high demand for a tour she would consider it. The petition may help in showing her management that her fans want to see her despite the lack of promotion. Maybe a petition will also help them realize that they need to do more promotion, and at the same time show that although her fanbase is small she can feel up some venues to capacity or if not close enough.

And I'm not saying she should have a tour in big venues or in a lot of cities in the U.S. but a few major cities in small venues could help and with a tour, promotion would have to come prior and during the tour.

And as for her ever opening for an American artist or any other artist, I wouldn't say its demeaning or there is anything wrong with it if she did but I can see why you think it would be unlikely for something like that to happen. Unless of course she were to open for someone she did a collaboration with, like Ne-yo.

I know wonder girls isn't having their own tour but opening for the Jonas Brothers' U.S portion of their World tour is actually something big because they will be promoting to a large audience. Of course, for wonder girls to go on a tour with Jonas Brothers works as a double-edge sword since most if not all of their fans are girls. Their fans may come to like wonder girls or hate them for being to close to their favorite idols. I've already seen some hate comments towards the girls for the news of them going on tour with the jonas brothers.

Anyways I wouldn't I say a petition would be completely useless or 100% effective.