In theory, what type of discovery or evidence might persuade an ever-edian toward a different interpretation of quantum mechanics? Well, there's sort of a fanciful answer to this and a more realistic answer. If you could talk to other universes or if you could detect them in some way, that would be a discovery that helps you do it. But I've said this before, I'll just say it again. All the evidence we have that there are wave functions of the away-the-Schrodinger equation counts as evidence for the ever-ed interpretation.