I've said the same thing before on the topic of The Shield splitting up but I'll say it again.
The most gratifying way for The Shield to end is for the group to completely implode. The Shield has always been a solid unit, they shared exactly the same agenda and never tugged the group in different directions even when there was dissension. That theme needs to stay intact even when they split.
What I want to happen is for the three members to eventually get so frustrated with each other that it reaches a boiling point and they just go at it after losing a match (would be a nice Wrestlemania moment but it can happen on Raw too where we will all see). The reason I want this is because it's so satisfying and a solid end to a great faction. After months and months of The Shield interrupting matches, carrying out The Authority's wishes and ganging up on people, watching the explosion will be glorious.
This report suggests the exact opposite of what I want though. I don't want the members to tug in different directions and splinter away, I don't want them to fizzle out like the Nexus with WWE hoping we don't notice, and I REALLY don't want the group to try and change stuff like adding/replacing members.
I think of it like this: If WWE wants The Shield to add or change a member then I assume they don't know what else to do with the group as it is. So, why not just end it so the members can move on? Let them go out on top? It's a matter of whether WWE wants them to go out with a memorable bang while they have the perfect opportunity, or keep squeezing The Shield for what they can and kill it after fans are sick of it.
... Oh, and Reigns obviously destroys the other two, he's got a big-ass spear waiting for the both of them.