I'll just have to echo this. I am hardly an influencer, but I was disappointed with the DMG when it first came out. I was hoping for the modularity that was discussed so much during the playtest, and it just wasn't it.
I don't know how much is going to change in the next Edition, but unless there are big changes, to either the system or the new DMG, I'm not going to be interested. And you know what? There's nothing wrong with that. Just like there's nothing wrong with liking what's in the current book.
I do think WotC is in a bind, though: if the next edition is very much a "5.5" what would there be in the new DMG to make it a useful pickup if you already have the current one? And if it's very different, what's going to be there that will be truly different? I'll tell you that saying "feel free to make up what you want" isn't going to convince many people that they need to buy the book.