I can understand the logistics problem of this....but liability?? Give me a break. All they'd have to do is have a CM escort the character, just like they do in the parks, AND require that one parent be present. It's as simple as that.
Like I said, I can see the logistics problems....costumes fitting down the narrow hallways....running into other kids in the hallway who want would want Mickey's attention as he's trying to get to a room to tuck a kid in, etc. But there are definitely ways around the whole "liability" issue! It wouldn't have to be a big drawn out thing, maybe 15 minutes spent per cabin, no matter how many kids are being "tucked in" in that cabin. The CM could "speak" for Mickey and say "ok kids, get into your beds, Mickey will tuck you all in now" and Mickey would do his mime act like he does all the time, in the parks and other character interactions. Maybe this CM could be a face character, so he/she would still be part of the whole character thing, too. Or maybe just have ALL face characters, plus a CM in uniform to escort them. There are ways to do this....
They could charge $50 for 15 minutes worth of time spent, per cabin.
I can understand why Disney might not even want to bother with this, but it COULD be done, in my opinion.
P.S. Rae, it was Donny Osmond who sang that song, not Michael Jackson.

I had a crush on both of them back then, I remember this vividly. LOL