I agree that the conceptual (non-simply-symbol-processing) part of theoretical physics is the tricky part to automate, and even if I am willing to accept that that last 1% will be kept in the monopoly of human beings, but then that's it; theoretical physics will asymptotically reduce to that 1% and stay there until AGI arrives. Its not bound to change over night, but the change will be the product of many small changes where computers start to aid us not by just doing the calculations and simulations but more advanced tasks where we can input sets of equations from two different sub-field and letting the computers using evolutionary algorithms try different combinations, operate on them and so on and find links. The process could end where a joint theory in a common mathematical framework succeeds to derive the phenomena in both sub fields.

EDIT: Have to add that it feels a bit awkward to argue against the future necessity of my "profession"..