I definitely agree. (just like coffee that is so hot that it causes the need for skin grafts is too hot, especially when there had been many other burn claims in the years previous and they still kept it that hot!)
If I had many medical bills thanks to a company keeping something WAY too hot, then yes I'd sue.
But we are vigilant about keeping boiling hot things away from DS (especially after he suffered a water burn on his chest thanks to a father letting a 3 year old "help" make pasta), so I would trust US that we had done everything to protect him. Of course, I always tend towards distrusting others, especially when they make comments about 4 year olds not being able to watch out for hot foods (and think "uh yeah, that's what you are there for" and then I think "from now on he'll watch out for it, just like DS learned real quick at 3 years old to be nervous about water that might be too hot").
But the system will decide if the case has merit; if Disney caused it, it'll go forward, and if the family caused it, it likely won't.