Hi Chuck,
Just some input on stem cell therapy for hips, based on my experience. Before I had my resurfacing, I ran across the same information that you mentioned on the stem cell work being done with dogs. I called and researched around the world, and found a Dr in Colorado that was doing basically the same thing with human knees, and claimed some success. He had not done a lot of hips, but had done a few, and felt that it might help in my case. For me the stem cell treatment was a disaster, and I went from skiing and walking with some pain, to instantly being unable to walk at all without crutches. It got progressively worse over the next two months, and lead to me getting the resurfacing. My understanding is that the process has since been regulated by the FDA, so that it is arguably less effective than it was when I had it done.
There were some reports of people having good success with this treatment in knees; but for me, the good news was that it forced me to stop procrastinating any longer to get my hip resurfaced since I could no longer walk, swim, or do anything else.
I, like you, continue to hold hope for this in the future, but my recent experience would indicate that it is a way.