I’m not Mitchell, but I think I agree with him here enough to guess: He probably means to say that production of new plausible theories has increased, production of experimentally verified theories has stalled, and the latter is not string theory’s fault.
(And of course this whole discussion, including your question, is interpreting “physics” to means “fundamental physics”, since theoretical and empirical work on e.g. condensed matter physics has been doing just fine.)
I’m not Mitchell, but I think I agree with him here enough to guess: He probably means to say that production of new plausible theories has increased, production of experimentally verified theories has stalled, and the latter is not string theory’s fault.
(And of course this whole discussion, including your question, is interpreting “physics” to means “fundamental physics”, since theoretical and empirical work on e.g. condensed matter physics has been doing just fine.)