"There are still many developers who would not touch javascript with a ten foot pole but I can see them using a saner language like Dart." haha sir you need some reality check.
Anecdotal, but I'm a mobile developer who also dabbles with some web apps and I hate Javascript.
But do you program in Dart? My point is, when given a choice I can't see a reason why someone who would invest their precious time to learn some relatively obscure language like Dart would NOT learn javascript. Also hating something and not using it are two different things. You say you hate javascript but you probably do use javascript.
I used to hate JavaScript. It is a very imperfect language, but many of its pitfalls come from widespread mediocre practices and craftsmanship, rather than the language's quirks.