Why hasn't this garnered more attention? The movement described indicates a pull, since it's a convergence. If there's something 46 billion lightyears away exerting a force on galaxy clusters, it obviously isn't part of a 14 billion year old system that started from a single point. It also represents a force that hasn't to date been accounted for. It also may suggest that there are more "outside entities" exerting force on our universe that we are currently unaware of. Like mice, if you see one, you probably have lots more.
http://en.wikipedia.org/wiki/Dark_flow
Cosmology seems to be stuck on the notion that our universe was created in a void. Dark flow and the "axis of evil" phenomenon seem to suggest otherwise. Why is it so hard to imagine that our universe is part of something larger? Especially when evidence seems to point in that direction.