How fancy is it? I'm thinking that your kids aren't interested because they don't feel any connection to these dishes that they have only seen used three or four times in their lifetime. If you used those dishes, the kids might feel some connection with them.
A number of years ago, Flylady had an essay about saving your things for 'good'. She mentioned that she had special dishes that she saved for holidays, special linens for guests, special towels for fancy use. And that she didn't get any pleasure out of them while they were stored away. So she decided that SHE was worth it and she deserved to use the special things to make her feel happy. Then she started using her 'good' things on a regular basis because she is worth it.
Maybe you can think about that and consider that maybe it might be nice for you to use them yourself for a while (not necessarily all the time, but once in a while, maybe for Sunday dinner once a month or something). I started using my wedding china about 10 years after we got married. I chose fairly sturdy type of china, but we started using them most of the time and we enjoyed them very much for more than 10 years. I did recently get rid of most of the remaining pieces (I donated them to goodwill, actually) but I think it was worth it. If the whole set is only worth $100, you dont' have that much too lose by actually using them.
I've tried to convince my MIL about using her China (or at least unpacking it). She's been married over 50 years, and got 12 setting of Haviland China for her wedding and has NEVER EVEN OPENED THE BOXES...they are still sealed in the orginal packaging, and she doesn't even remember what the pattern looks like, but she still says they are 'too good to use'. I told her she might as well use them now because when she dies, they are going somewhere and it isn't my house

and her other son definitely doesn't want them either.
If you really think you are never going to use them, I'd suggest donating them to a battered womens shelter or somewhere that helps people in a difficult situation to set up a new household.
Another option would be to donate them to a church (our church has tons of sets of china in different patterns, and uses them every time there is an event at church).