This is a very good post, but I wonder: One of the authors in the paper you cite is David Wallace, perhaps the most prominent proponent of modern Everettian interpretation. He just published a new book called "The Emergent Multiverse" and he claims there is no problem unifying MWI with QFT because interactions within worlds are local and only states are nonlocal. I have yet to hear him mention any need for serious reformulation of anything in terms of MWI.
You said you suspect this is necessary, but that you hope we can recover a similar MWI, but isn't it more reasonable to expect that at the planck scale something else will explain the quantum weirdness? After all if MWI fails both probability and relativity, then there is no good reason to suspect that this interpretation is correct.
Have you given Gerard 't Hoofts idea of cellular automata which he claims salvage determinism, locality and realism any thought?
You said you suspect this is necessary, but that you hope we can recover a similar MWI, but isn't it more reasonable to expect that at the planck scale something else will explain the quantum weirdness?
When I talk about recovering MWI, I really just mean absorbing the lesson that our theory does not need to deliver determinate measurement results, and ad hoc tools for satisfying this constraint (such as collapse or hidden variables) are otiose. Of course, the foundations of our eventual theory of quantum gravity might be different enough from those of q...
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