The inclusion of joke topics like podiatry and pogonology can't help either.
I disagree. If someone feels strongly about only one or two of the topics, they'll still feel the need to use all three votes. Podiatry and pogonology work as a sink for those votes, so not as many people will vote for a topic they don't really care about. Just so long as they don't win, it's fine.
Edit: My votes:
Psychology/SociologyI'm interested in how dwarven personality affects happiness, relationships, and, well... everything. I hope more effects are added in the future, though there is a worry of it being too complex and random. It may be difficult to find a balance between personality effects be negligible and pointless, and being forced to tediously tailor each dwarf's job to their personality lest they become useless or insane.
LinguisticsI'm actually thinking of changing this one. I thought a lot on it, and everything I wanted from it I now realize is stuff about the content of adventurer interactions/conversation, rather than the actual language.
AstronomyI'm really interested in this one, just because I've heard absolutely nothing about it. It's the only one up there that's completely unrepresented in game, and I haven't seen any talk about it. When you're looking straight down at your dwarves, it's hard to remember that they can look up, to the stars.
Meteorology
I'm a little interested in this one, mostly thinking about floods, drought, and lightning. I imagine a drought would be much less fun than a flood.
Geology
I'm sure there's some interesting stuff about rocks here, but I really just want to know about volcanoes. Eruptions sound like a lot of FUN, and seismic activity could also be implemented when cave-ins are fixed. Fault lines? Ash disrupting weather patterns? This one could turn out really interesting.
With floods, drought, earthquakes, and eruptions, there's an issue of things getting out of player control. Eruptions and floods are easy enough, because you can assume the player is opting in to these situations by embarking on a volcano or a marsh or a large river. Drought and earthquakes on the other hand... If your stream dries up and you have no way of irrigating your crops (which perhaps now require it due to lack of rain), that would be bad. Earthquakes might be alright as long as they only did minor damage, and don't just completely destroy your fortress, killing 80% of your dwarves.
This post is getting really long, I think I need to stop now