Bendis had to get rid of the vision and wanda as their dull back story made them unwritable. Sending wanda nuts due to over extending herself during the red mist storyline was one way to do that which did not require the reader to stretch back thirty years to understand it.
I'm thinking of changing my name to bendisfan as I think I'm the only one left.
Well, that might have worked if the Dissassembled storyline ever referenced the red mist storyline. Bendis is great at major concepts and at specific point in time interactions, but the follow through and plot structure inbetween aren't there.