Which forum would be the gateway in such a setup, though? The Tavern and Chamber are nominally equal, as are all the other Colosseum subforums. One of the OTs would end up being the gateway, but unless we are to prefer one to the other (which would most likely be the Chamber due to site image considerations), there'd have to be a merger in any case.
The forum view would also be rather messy; see recent complaints about 'All Other Games' and the number of subforums you have to scroll past to get to threads.
Given the overwhelming popularity of the Tavern and unpopularity of the Chamber, I would think the Tavern is the more logical gateway. You surely do not want all the riff raff headed for the Tavern to sully through the Chamber on the way there.