Life2 = Revived from KO/Wounded status, not death.
Yeah, I agree, it's been over 7 years since the game came out, and still people are mourning for the death of one character (a very good character, though). Even though by now, everyone should know that she can't be revived, people still ask for a way, or believe those silly rumors that she comes back to life in the Japanese version or that you can get Tifa killed instead of her. But that's all false, Aeris is gone.
For those who are really, really desperate for her revival, let me say one thing. Cloud said he could meet her again in the Promised Land. This could mean that he'd meet her again in after-life when he dies, but Tifa's reply "Yeah, let's go and meet her" doesn't exactly suggest to that idea, unless she wants Cloud and her to die and meet Aeris. Which I doubt. So I think the Promised Land lives in everyone's hearts, so if Cloud keeps Aeris there, she'll always be with him. And whoever keeps Cloud inside his/her heart will make sure Cloud will always live inside that person. So that way, Cloud, Aeris and others will never truly die.
Aeris was a great character, but now she has become "one with the Planet." So farewell, Aeris (and see you again in KH, KH CoM and KH2
)!