I realize I'm in the minority here, but I'd actually love to see ALL of the non-meal meet and greets morphed into more of an attraction like this. *ducks* I know, I know...you guys don't agree...don't throw anything at me!
Now, granted, for kids who have grown up with particular expectations about meet and greets (ahem, I'm looking at you kids of Dis-ers!), yes, this kind of change would come as a shock and potentially a disappointment. I do understand that. But let's set that idea aside for a moment and pretend you're talking only about someone with zero expectations.
To me (you may feel differently!), an interactive, take-you-into-the-story experience is far, FAR more worthwhile and fun than standing in line for a quick hug and photo and see you later, next please!
Instead of standing in line for hours for a snapshot next to Jack Skellington, what if you could participate in one of his experiments as he figures out how to "make Christmas"?
I did think the original (and all too brief) experiences for Rapunzel and Merida were great ideas, with the immersive activities (dancing, learning to shoot a bow and arrow, etc.) leading up to the actual meet and greet. But I think Enchanted Tales with Belle takes that even a little further--and I like it! I wouldn't be inclined to wait in character lines (unless DS4 wanted to), but even as an adult I'd be interested in ETWB (wouldn't necessarily take a part, but would definitely watch).