I'm kind of getting a bit wary of the whole "everything must be voiced!" trend that seems to be popping up around here recently, and this is coming from someone who's (technically) the moderator of the voice acting subforum. I've never had any trouble getting immersed in a good campaign that wasn't voiced, and I feel like jumping all over each and every new campaign coming down the pike only helps to promote the "I'll only play voiced campaigns" viewpoint that's disturbingly manifested itself at certain points in the past. While good voicework can certainly benefit a campaign to a certain extent, the opposite can also be true of mediocre or downright bad work, and one has to weigh any potential gains against the large amount of man-hours and organizational headaches that naturally come with such projects. I certainly think that high-profile projects like Silent Threat: Reborn and Diaspora practically require voice work, based on what they're specifically trying to achieve, but I don't see how that necessarily carries over to your garden-variety campaign release.
All of that being said, I voted for the last option. Do what you will, since my original enjoyment (and/or frustration) of the campaign won't be affected either way by whether or not someone starts working on voicing it.