I've explained elsewhere (so will keep it real brief here) that we are going to address that challenge (of supporting unpopular niche communities better than we do now, which I've described elsewhere as our biggest social challenge on a2k) in a variety of ways, likely including:
1) The option to just hide, not vote down a post (as suggested by Monger the week the site opened). The option to vote down is needed, in order to let the community censure topics, but for those who use it just to hide topics we'd like to make an option that just does that).
2) The option to filter tags entirely (again, I think this is one he suggested right off the bat too). This should let people just hide all topics from niches like the droid forum, crosswords or water softeners if they want and they don't have to vote each one down individually.
3) A different ratings system using a weighted Bayesian algorithm
(short version is that most of the 0's would just be around 5.0 in the new system and be less psychologically negative, while also limiting some of the downfalls of the current ratings system). It's basically a weighed percentage so it won't ever be able to reach 0.
All of those changes have been in our plans for a long time, but all are really big deals, so are taking a while to get around to.