There won't be any more simply for the reason that time travel is way too powerful, especially in a wizards hands. Rowling confirms this when she says something to the effect of "Nasty things happen to wizards who fool with time."
Having it around creates all sorts of problematic story issues which is the reason she had them all destroyed and probably a good reason that it shouldn't have been used in the first place. It was just an easy, convenient plot device. |