Why is it ridiculous to cater to a kid? The OP clearly loves his daughter and wants her happy. I don't think kids should be spoiled but I think it's fine when your going to spend thousands of dollars to go at a point when you know your kids will be happiest. If again, they had already booked the trip and were suddenly canceling because of one ride...I would probably find that ridiculous. But the trip hasn't been booked so what's wrong with changing the time of a trip to a time when it's open. People change their trip dates all the time for many different reasons. And to your question about "would the OP rather have Splash not be in refurb"... that's a pretty gross exaggeration and twist of words from the OP's original post. I don't think he ever gave any inclination that he wishes it weren't being refurbed or that it should never be refurbed as you seem to want to twist the argument into.
Dude, come on, give me a break. Selfish is a pretty strong word to use in this context. He didn't even say that his kid wouldn't want to go to WDW because the ride was down. He's just choosing to go at a later time. There is another thing you just twisted. But now you seem to be insulting the way he is raising his child...key on the world "his". He decided that this wasn't the right time for his family and they'll go a later date. That could mean 2 months, 6 months, a year, whatever. Everyone has to decide to go on the date that is right for their family. This wasn't it for the OP. It's not even about money...though you seem to want to make it into a money thing. It's just about choosing the right time to go.
There are many many people that care about "trivial crap" in terms of their vacation. Why do you think people go at different times of the year than others? It could be a ride, a special offering from Disney, simply that they think the weather could be bad. I am sure if you listed all the reasons for the dates you choose to go to WDW, we could find some pretty "trivial crap" in there too. What's trivial to one person may not be to another as well. It's all relative.
It's true there are very many people who can't afford to go to Disney but again, you are making the original post into something way different that what it was about. Heck, for people who can only afford to go on that once in a lifetime visit...it might actually matter more if the "big rides" that make the place so famous (like Splash or Space Mountain or Everest) are actually open at the time. If you are only going to get to go once, you are going to want to experience as much as possible of what the place has to offer. Those people choose their dates just as carefully as people who go yearly do.