It's not only combo decks that utilize the graveyard: Loam decks make good use of it, too. And the Highlander mulligan helps as well: You can throw graveyard hate away if you know you're not playing against combo, or try to dig for more hate cards with it. As far as graveyward hate goes, we now have enchantments (Leyline, Planar Void), instants that can be played for free (Ravenous Trap), cheap and free artifact hate (Relic of Progenitus, Tormod's Crypt), cheap and free creatures that can hate the graveyard (Yixlid Jailer, Faerie Macabre), and Worldwake is even bringing us a common land that kills a graveyard when it's played. On top of that we have exiling removal like Swords, Path and Oblivion Ring. The hate is pretty easily integrated into a deck without hurting it too much, IMHO.