The golden rule of forum administration: Only add new forums to divide heavy traffic; not to categorize discussions.
I don't think we have enough traffic to justify one new forum, let alone five! So one forum for mobile/web game development would be better than five.
If the "golden rule" were followed too strictly, the Web would be devoid of forums. I mean, why put up a forum at all if there aren't already lots of forum posts on the site? It could become quite a Catch-22 situation.
The main reason the new forum topics were added was to cater to newer frontiers in game development. We have entire technologies omitted, and their corresponding languages are not served adequately elsewhere by the forum. Given that, there's a big void in what we cover -- and people tend not to participate in forums unless they see a reason (and a place) to.
But if all five are staying, then consider creating a new forum group "Mobile & Web Game Development Discussion" for the five new fora. It can go beneath "Game Programming Discussion" Because as it currently stands, the list isn't easy on the eye.
I agree -- having a long list of forums with no visual divider is a bit of a problem. It makes things a bit congested. Hopefully before long we'll have a section header of some sort to give a more organized look to the main forum list.