One also has to remember that Google itself intends to use this language a lot, so it's much more likely that they approximate something they already use. And they're doing a lot of Java, where Dart doesn't seem too exotic. In some other thread, Dart was compared to GWT, and I think that's getting pretty close. For teams that would've used Java/GWT before, doing it in Dart instead isn't a huge jump. Probably not even as huge as Scala, where at least you'd be able to remain within the secure embrace of the JVM.

(Not a huge jump for Android programmers, either. In light of the Oracle lawsuit avalanche, this might be interesting…)