 The aim is to obtain probabilistic predictions for what a typical observer should see in the EI multiverse. Yet there are several challenges to overcome, alongside those mentioned above related to anthropics. The assumption that the formation of pocket universes leads to variation in constants is just an assumption, which is not yet justified by a plausible, well-tested dynamical theory. The most widely discussed challenge in the physics literature is the “measure problem”: roughly, how to assign “size” to different regions of the multiverse, as a first step towards assigning probabilities. It is difficult to define a measure because the EI multiverse is usually taken to be an infinite ensemble, lacking in the kinds of structure used in constructing a measure. On our view, these unmet challenges undercut the hope that the EI multiverse yields probabilistic predictions. And without such an account, the multiverse proposal does not have any testable consequences. If everything happens somewhere in the ensemble, then any potential observation is compatible with the theory.