Originally Posted by RAINMAKER
When you think about it, Talia was smart enough to the point where she didn't need Bane. The failed energy project already put Bruce in his own hell. In fact, she could've kept doing these things "behind the scenes" like Ra's's LOS. Kind of like what Edmond Dantes did to his enemies in The Count of Monte Cristo.
Plan A - seducing Bruce Wayne and getting him to leave the country
Plan B - having someone stronger than Batman to beat him and take him out of the country
That's the biggest reason why Bane is needed. Someone to defeat Batman; someone that was hands down even stronger than Ra's al Ghul and Talia didn't fit the bill.
Plus, the whole needing an army bit as well that would work on the Tumblers and what have you.