Not another Legion relaunch... I think they would be best served in that by just starting over from the beginning(yes again) Just the original three and go from there. Otherwise to many characters and planets and so on for any new readers to just jump in.
I stopped Demon Knights after the first arc but it was a fun read there. Threshold I think suffered from just being a book with unknown characters in it. Tossing in a Guy Gardner from the start say would have helped out a lot.
Dial H was just a bizarre title and would have been an excellent Vertigo book.