MEF: a replacement for PRISM?

Edit: Do not read this answer. It is embarrassingly wrong. I am fail.

Read Glenn Block's below.

Today I would say Prism and MEF complement each other. Just as Prism and Unity. Prism introduces a set of specific services like RegionManager, DelegateCommand, and EventAggregator which aid in building composite apps.

MEF on the other hand is a more general composition mechanism for extensibility of applications and frameworks whether they are composites or no. The key distinguisher about MEF is it's discoverability which means that it can go out and discover all the available parts dynamically.

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