I find iDVD a useful app, even for pro use. If I make a short video in FC I use iDVD. It's simple and doesn't take much time. If they just combine it with iMovie then the way I do some things will be a pain. Not to mention I prefer the previous generation of iMovie. I really hope they don't get rid of iDVD unless they call iit something els, which I don't believe they will, I like new iLife updates but don't take away the apps just make them better...IMO.
Like everything if you don't like it don't use it, that simple. Again IMO.
I don't see how iMovie or iDVD are usable even on a consumer level. They're dumbed down for the lowest common denominator. Combining them would be ideal, but why not focus on giving iMovie/iDVD more features, specifically in the editing arena? I feel like I'm using the trial version of some imaginary official app.