I always shoot RAW and I am impressed with the improvements of Adobe Camera RAW 7 (in Photoshop CS6, Lightroom 4 and to a lesser extent in PSE-11). However, there is an advantage to shooting RAW that I have not previously considered.
When RAW capture is used you have a "bucket of information" captured and ready to be worked with. However, the capture is non-destructive and you can revert any time back to the original RAW image.
This means that I could, if desired, revert back to some of my original RAW images that I captured and processed in ACR-6 and then re-process them in ACR-7 if I so desired. This capability to re-process in a more efficient program can perhaps improve some images. IMO, ACR-7 can provide better imagery, especially at the edges of the envelope, than can ACR-6.
If I shot with JPEG, whatever the camera's logarithms had decided my image should look like is what I would have to work with. I "may" be able to re-open an image and tweak it a bit with a new improved program (CS-6 rather than the earlier CS-5 and lower Photoshop editions) but, I would not have the control over the final image that I would have if I reverted back to a RAW image. And, if I had not saved the original as a duplicate, I would not be able to reprocess "from scratch".
Many JPEG shooters state, "If the photographer is accurate in the original capture, JPEG is just fine!" I will agree that todays JPEG capture can provide mind boggling quality but, I also occasionally shoot under troubling conditions in which a totally accurate capture is not always possible. This can be because of the lighting conditions or because I made a stupid mistake. That is just me, I am "sure" that none of the CiC members ever make mistakes....
Sure, someday, The RAW might change and make the present RAW "information bucket" obsolete. But, if we still have the ACR edition on our computer that will be able to open and process the RAW image, that should be no problem.