It's not an oversight. They've said (r and rsc) that they want to wait and make sure they get generics Right in the context of the rest of the language, and make it an easy feature to use in the presence of everything else (should it ever be added.) I'll admit, I've wished for generics occasionally myself, but it's been remarkably rare in the end.
> They've said (r and rsc) that they want to wait and make sure they get generics Right in the context of the rest of the language
In this case, wouldn't it have been better to ship 1.0 with generics?
Retrofitting generics in a language already released with an existing code base sure doesn't seem like the best way to make sure the feature is "done right".