So themeparkfan, it sounds like that may be the answer to the wand dilemma. If the shopkeepers are trained well enough, they can make the wand purchasing experience mirror the Ollivanders experience, minus the special effects. I think that should appease a lot of people, esp. the little kids. You end up with "your special wand". Sounds good to me.
I do believe that would appease my boys if they still got to feel like the wand chose them even without the special effects. That would be better then just picking up a wand off the shelf that would have no special feel to it. just another purchase.
A couple last points and I'll go back to being a wall flower. I would never want to take the wand experience over a youth, no matter how much I would it myself a child comes first! I won't be crying in my butterbeer if I don't get a wand that chooses me. Disappointed, yes but not distraught.
I know I will still enjoy myself at WWoHP, despite any disappointments, I'm going to have fun no matter what.