Just because grandpa is dead doesn't mean anyone has filled his job position. Nothing useful has come from string theory in a very long time. Or are you still stuck in infinite tiny dimensions that can predict anything and everything, except something testable?
Oh don't misunderstand I am fully against String Theory. I just was not aware anyone considered it dead as in literally no longer controlling the Theory field. I'd challenge you to find good postdocs in High Energy Theory that aren't String related as a gauge of what the field is still focused on.
Is it in fact dead?