I'm just a lowly pre-med, but I've had two hip arthroscopies with a 3rd on the way. I think the future for this procedure is bright but, from what I've read, it has a huge learning curve and is only effective for a relatively small population. Both scopes I've had at this point have been on my right hip--the first to treat a labral tear and the second for another labral tear and to shave down a boney impinging abnormality on my femoral head. The surgeon that did the first did a rather crummy job and missed the joint abnormality so I needed the second surgery (which was done by a different surgeon with about 10x the experience). The third surgery will do the other hip.
I suppose that that was a rather long winded way of saying that, in the right hands and on the right people, hip arthroscopy can have great results and I think that will only expand as more surgeons become experienced in it.