Count me as one of the people who will be glad to see Zune go away...although I suppose it depends on what takes its place. I've never used iTunes, so I'm unmoved by the claim that Zune is "way better" than iTunes.
First of all, the meaning of "sync" in the actual English language is for two things to act in synchrony, so that what happens to one happens to the other. So if I create a "media folder" on my computer, and I put music, photos, videos, and documents in it, anything I add to that folder gets added to my phone; anything I delete gets deleted from my phone; and anything I add or delete from my phone gets added to or deleted from the folder. That's what sync means.
The question is: Why would I want to do things that way? Why would I want to have a folder on my computer that is a mirror of what's on my phone? I can understand this in the case of documents that I'm actually editing, because I'm changing those files and like to be able to access the most current versions from various devices. And I understand the reason to back up files to the cloud or wherever, but backing up isn't the same as syncing.