> If a language made defining decorators simple, I think it'd remove a lot of what people think of as the use-case for inheritance. (I mean, you aren't supposed to use inheritance for Decorator-pattern use-cases--it will likely break further and further as you try--but people will keep trying as long as the first steps are so much easier than the alternative.)

I actually agree with this, and I'd be interested to hear of language efforts in that direction. But until there's this easy way to do decorators, just telling people "don't use inheritance" isn't going to work.