closed as off topic by Manishearth♦, David Z♦ Dec 1 '12 at 22:31
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We still don't know how high-Tc superconductivity works. We don't know what dark matter is, or why dark energy exists. We don't completely understand the mechanics of supernovas. We can't go from the parameters of the Hubbard model to the physics of the materials it models. we can't predict the half-life of radioactive nuclei from the standard model. All of these are theoretical physics questions. And there are lots, lots, lots more.
What might be dead is some of the theories in a small subarea of theoretical physics speculating on what lies beyond the standard model, since no evidence supporting any of them has been found by the LHC. But even if all of these theories were ruled out, there would still be lots and lots of interesting open questions that fall under the umbrella of theoretical physics.
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You completely misunderstood this. That the theoretical physics SE site was not successful in the SE network (it did not fail, it was a nice high quality but too small site) has nothing to do with the amount of research that can still be done in theoretical physics as a research field.
And as a research field, theoretical physics is not dead at all ;-).
So wherever you have heard or read from that there is nothing left to do in theoretical physics, this is plain wrong.
Edit to adress comments
The standard model is only an effective theory that describes physics very good at the low energy scales we can access with the current colliders up to now. So even though the newly found higgs was the last stone in the puzzle that was missing, the standard model itself is incomplete. There are many questions it does not answer as you can read for example here. So there is still plenty of work to do and things to discover for theoretical physicists and my answer to the question if nothing new can be done in theoretical physics is a resounding NO.
The LHC allone will never be able to rule out everything beyond the standard model, as certain bloggers, media, etc wrongly claim. Why this is can be read for example in Prof. Strassler article here and in his related recent posts about SUSY for example.
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