I was wondering if TTA operated during Wishes? It would probably provide a good view of portions of the fireworks. I know that many areas around the castle are closed off during the fireworks, but I wasn't sure if the TTA operated at that time.
As long as the Magic Kingdom is still officially open when Wishes is going, then I believe that the TTA will still be running. However, unless you have seen Wishes before, I don't recommend doing this. For one thing, about 2/3 of TTA is indoors, and of the outdoor portions, there are only occasional views of the castle. You would actually miss most of the show. Just my recommendation...
I also wouldn't recommend it. I like TTA - it is a relaxing quite ride. Howevder, it is certainly not something I would miss Wishes for. Try riding this during one of the hot afternoons when you are there - it is a great way to get out of the sun for awhile and just relax. Then that night grab a seat and sit and watch Wishes - you will be glad you did. JMHO.