Would be cool, seeing that I LOVE Okujou no Yurirei-san to death, but I don't see it happening.
Yuri anime isn't a very popular genre in Japan, as far as I'm aware, and the Japanese media/anime industry clearly does not care much about overseas reception. Petitions for this sort of matter are just pipe dreams, so even if they DO decide to make an anime out of this, I can 100% guarantee it's not a result of this petition.
I think the series is fine as a game/drama CD series, frankly. Maybe a manga/light novel adaptation would be more realistic (and no, I'm not referring to the Side A/B doujins), but again, I don't see that happening either.
Nonetheless, you can hope and wish for it and maybe it'll actually happen one day - probably in the form of an OVA if anything. Keep your spirits up and just look forward to the English translations for the drama CD series. If you want to follow another upcoming yuri VN, take a look at Lilycle Rainbow Stage, which is coming out on April 28th. :)
E: By the way, rather than a petition, it would be FAR more reasonable to start a kickstarter. However, that kickstarter would need to be made by the creators themselves for it to be the least bit legitimate.
i know there's small chance to get animated, but still there's some hope to it, yeah i still wait for drama cd too :)