As an all-star weekend non-watcher for years, I am not sure what would get me interested. I think the rising stars game is reasonably interesting, but I can't say that there is anything that would get me to watch the slam-dunk, 3-pt or skill competitions. In the heyday of the slam-dunk and 3 pt competitions, I was only borderling interested -- so I doubt there is much that could get me into that.
Re: 1 on 1, the risk of injury in competetive 1:1 would probably rule it out, but that is somewhat interesting to me. Back in the day (70's) they had an NBA 1:1 competion that they showed at half-time during NBA games of the week (that's what I recall anyway). Seemed to last all season -- must have been filmed in the off-season. I remember JoJo White always did well.