I've been waiting for these studies to be completed, like the one from Seattle. I haven't searched for the actual journal articles yet, but according to that MSNBC report, the results show comparable results between traditional and compression-only CPR, which was a bit surprising. From previous smaller studies, I would've expected better results for compression-only, especially if these researchers are comparing people doing traditional vs compression-only purely from telephone instructions in a high stress situation.

Even so, as long as more people overall are willing to do compression-only CPR, even if it doesn't increase the chances of survival versus traditional CPR, more people will be saved since more people will try to help, and that seems like a net positive.