I wanted to update my situation where several kids had wishes for the same ride, I'd install it, and then they all changed wishes to a different ride. I'd install each ride, and they could not be satisfied.
Today, I noticed a smiley face on the 'card' as a reward for Lost Boys Treehouse. There are never smilies as rewards, and thought that was strange. So I re-installed the Treehouse into the park. Then Peter Pan showed a quest for 'Renovating the Treehouse'. I assigned him to that, and then all seven of the un-satisfyable wishes changed from white to greyed out.
But they hadn't gone on any rides, they were just seven kids wandering around with greyed out wish bubbles.
So I re-started the game, and there were NO wishes entering the park. But I zoomed over to where I'd installed the Treehouse, and all seven kids were lined up and one after another their wish bubbles changed to (low level, cause I'd lost all my happiness since the wishes were broken) smilies!!
Now for the long ride back, toward squinty-eyed big smile. It's hard getting used to one point per smile, versus four.