Funny poll results. (Almost) Nobody seems to like Oblivions system. I'm actually IN favour of voiced dialogue as it helps a lot to create immersion etc, but the biggest problem is the limitation of the lenght of dialogue as well as the similiarity of many voices. I found it pretty annoying to have people kind of talking to "themselves" in the city due to the lack of voice actors. It's also annoying for modders...
I think Oblivions dialogue system has earned a lot of criticism due to the very limited amount of answers and dialogue you could choose for yourself, thus always being forced into the same way, ignoring the difference backgrounds and interests our characters might have rp-wise.
If TES V finally comes and I'm not 80 yet, I want it either to be similiar to Fallout but with a bigger dialogue tree etc, or textboxes like Morrowing but I assume this would feel like a downgrade to most people. Funny thing though, as Oblivions system felt like a downgrade to me compared with Morrowind, but this simply depends on your own our perspective I guess.
Those synthesised voices people were talking about is pretty much out of question, it's not developped enough yet. I give it about 4 years till the first game uses this technique and hopefully clears the way for it, though I wonder how the voice actors are going to earn money then