There are some higher-end ones, but I don't see that being a viable (or commonly available) option. Besides, you kinda already can-- archive.org and all. Just don't expect the experience to be as good as native.
I don't remember what happened to the "run linux stuff on chromebook" project, but that might be another way if that didn't get killed off.
But yeah, I'm with RB-- experience won't be great in general. Even a cheap end ultrabook would probably run circles around most Chromebooks.