I don't know how DC could fix the Titans. Hunt could have generated some new interest in the franchise but judging by sales it isn't working.
At this point I think they should just replace TT with a new Young Justice (that brand isn't as damaged as Titans) and see how it does.
If there's enough interest, launch a New Titans book featuring mostly non-legacy heroes like Beast Boy, Raven, Mal Duncan, Bunker and Power Girl.
All this would only work under new editors, though. The current ones have shown time and time again they have no idea where to take the characters.