If I go to BYOND RPG right now, it shows me all the games that have been approved by that guild. Other games may have hubs, but they won't be displayed there. Isn't this exactly what you're suggesting the entire hub be converted into? Also, I'm not sure about the other guilds, but the anime one has a requirement that you have to be a member to submit games. So, it all sounds about the same to me, just turning BYOND into one giant guild...
Right, this is a not so much a technical change as a change in policy. Currently we have different groups handling different genres, but since some of those genres get little traffic, the communities (and submissions) aren't always maintained. For instance, Foomer constructed a nice site to organize single-player games (which we can pull into the initial listing), but since he has left, submissions there no longer work. Also, the submission system is currently fairly clunky (forcing you to join a guild to list your game as well as not clarifying the distinction between a "top 5" guild and others). This new idea just simplifies the process.
For categorization, the plan is to have the moderator set keywords on the entry when it is approved, and then present a "tag cloud" in the listing. Truthfully, I think the only genre line people in BYOND really care about is fangame vs non-fangame (or maybe even Anime vs non-Anime), so basing the site around categories was a mistake in the first place.
What you're suggesting sounds almost exactly how guilds work now, except instead of guilds, it will just be the entire hub.
If I go to BYOND RPG right now, it shows me all the games that have been approved by that guild. Other games may have hubs, but they won't be displayed there. Isn't this exactly what you're suggesting the entire hub be converted into? Also, I'm not sure about the other guilds, but I think the anime guild has a membership requirement to submit games. So, it all sounds about the same to me, just turning BYOND into one giant guild...
Also, there seem to be some bugs with searching inside the guild listing o.O unless going to the all games listing is intentional?