Give the TB some real power. I've used this as an example before, but it takes an act of TB to get a new forum going - and evidence of need must be provided, yet after it's set up, it's now the "purview" of the moderators.
So, they set them up but don't get a say what goes in them
If they're just an advisory committee, essentially just to set up or remove forums, quite honestly, why bother? The CD could probably handle the request and evidence herself - there aren't that many each year.