I've moved this down to the Suggestion Box because that's the best place for you all to, well, provide your suggestions. So feel free to vote!... although it would actually be more valuable if you can make a post providing specific suggestions for what you'd like to see changed. Otherwise we won't know what people want.

In the meantime, though, I'll give you some background. The subforums used to be a way more integral part of Furtopia than they are now. Furtopia started out as a web hosting site, and the forums were just a place for furs with webhosting accounts to come chat. A lot of them signed up for their own subforums to give them a place to share their art with others. Groups of furs soon started getting together to request their own subforums where they could talk about niche topics that interested them. (That's how Tech Talk and Foodie Furs happened, and those still get some good use.)
Nowadays, we have the opposite situation. The forums have totally taken over, and the webhosting is a much smaller focus. You can still request a forum to show your art, of course, but it's become much less popular over the years. (Neonlux is the only person I can think of who's requested a forum since like... 2007?) Most of the people who requested their own subforums have long ago disappeared, and only a handful of people still use most of them anymore.
The main option we've been talking about is somehow closing and archiving the subforums - or, rather, closing those that are mostly dead and moving the ones that still get activity to a more prominent spot. There are a whole lot of ways we could potentially do this, and we haven't decided on one. However, keep in mind that this is a huge amount of work on our part. Every subforum was requested by someone, so we'd need to first try to contact all the people behind the artist boards (at the least) and ask them what they want us to do with their art... and even if we didn't do that, we'd still need to figure out where to put all the old posts (as we don't permanently delete anything from these forums). Since we're all just volunteers for whom real life comes first, that's a pretty huge task that's pretty low on our priority list.
As for merging two forums, I've never actually looked into that. It could be possible, but I don't know. However, I would probably disagree with most of the merges you suggested, other than perhaps one involving "Furries on Furry." That's the only board you mentioned that doesn't have a distinct purpose.