And as far as "Theoretical physics has historically rested on philosophy and metaphysics;", if one looks at the definitions:
Metaphysics:
"Metaphysics is the branch of philosophy that investigates principles of reality transcending those of any particular science, traditionally, cosmology and ontology."
http://en.wikipedia.org/wiki/Metaphysics
Theoretical physics:
"The goal is to rationalize, explain and predict physical phenomena."
http://en.wikipedia.org/wiki/Theoretical_physics
Philosophy:
Philosophy is the discipline concerned with questions of how one should live (ethics); what sorts of things exist and what are their essential natures (metaphysics); what counts as genuine knowledge (epistemology); and what are the correct principles of reasoning (logic).
http://en.wikipedia.org/wiki/Philosophy
So , to me, the statement in the OP represents the intial search for 'genuine knowledge' whose "goal is to rationalize, explain and predict physical phenomena" by investigating "principles of reality transcending those of any particular science, traditionally, cosmology and ontology."
And yes, I agree with you
and arunma
and Bladibla
These are comments dealing with AFTER the theory has been made, and
using the theory (applied physics)--analysis, using the equations, etc.
from the theory--not the creative process of formulating what the theory is based on ("rested on"--OP's quote)--the creation process.
under 'research':
"The culture of physics research differs from most sciences in the
separation of theory and experiment. Since the twentieth century, most individual physicists have specialized in
either theoretical physics or
experimental physics."
http://en.wikipedia.org/wiki/Physics
I personally think a lot of the problem about the term 'philosophy' as it relates to 'physics' deals with those who 'create it' (the original theory) and those who 'use it' (data analysis, equations, etc.). When I going through and reading posts, I'd say over 50% of the posts deal with the 'philosophy' (metaphysics, epistemology, logic) of the subject.