Like SassyKnight said, you should have some faith
You don't know that Yume is dead. I certainly don't believe that, and not many Yume supporters on this forum do either! Only Hino knows for sure what will happen in future chapters, so I encourage you to not give up on Yuuki and Kaname being reunited!
I actually think that, at this stage, Yume is still a stronger ship than Zeki. I know that Yume is going through a tough time of late, since Kaname and Yuuki have been separated for a while now, but it is still obvious that they both care for each other. Yuuki is feeling conflicted about aiding the hunters in capturing the man she loves, and in a recent chapter Kaname pushed Yuuki out of harms way in order to protect her. They have conflicting goals at the moment, but they are not enemies.
Even though there have been a lot more scenes between Zero and Yuuki, there isn't really anything suggesting that there is a romantic
relationship blooming between Zero and Yuuki at all. To me it just seems like they are taking small steps towards repairing their broken (and platonic) relationship. In all honesty, they're not even friends yet. They're allies now, yes, so that is a good start for Zeki fans. But it's not like fans can use that as concrete evidence that they will end up together. It's obvious that Zero still cares for Yuuki beyond friendship, but we have no way of knowing if he will act upon it (seems unlikely, since he isn't really the mushy-affectionate type)
I think that since Hino has described the dynamic between her own characters as being a 'love triangle', then there is an equal chance of a Yume or Zeki ending. So irregardless of which ship you support Lucy, there is no reason
for you to think that Kaname and Yuuki are over
Hang in there! Manga publication is
for the entertainment of fans, so enjoy Vampire Knight while the series is still ongoing