This is more than a bit crude in my opinion. For example, philosophy of mind "becomes" neuroscience in the sense that sometimes philosophical questions become scientifically tractable. But we certainly haven't managed to translate _every_ interesting philosophical problem for any field, let alone philosophy of mind, into science. Assuming we have is actually a bit absurd.
You could maybe get away with saying that we're fairly confident that _at some point_ we'll be able to accomplish such a feat (translating all interesting problems into scientifically decidable ones), but even that would be a super hairy/controversial assertion.
You could maybe get away with saying that we're fairly confident that _at some point_ we'll be able to accomplish such a feat (translating all interesting problems into scientifically decidable ones), but even that would be a super hairy/controversial assertion.