I disagree. I think MAD would survive if the only forum they had was the fellowship forum. Besides, even amoung the saints there is disagreement about things.
It would survive, but probably not be as interesting to the very people they want to attract - The Apologists. The Apologists really want to get in the ring with critics, but they want to WIN, WIN, WIN. Frankly, most of the time that's not possible without rigging the system. Maybe one day, when all this marvelous evidence comes rolling out supporting, say the Book of Mormon in Mesoamerica, then it may be a more level playing field, but right now, The Apologists have weights on their ankles and still want to win the race.
But let's turn this back to MDB for a moment. What's more important to you? Would you rather have more TBMs, or would you rather have unrestricted fee speech where you can blaspheme and profane to your heart's content? And what do you want with TBMs anyhow? Would you try to learn why they still believe, or would you try to deconvert them?
The problem is that "profane" and "blaspheme" are vague terms. Wade once tried to argue he didn't have anything against criticisms being made against the church, but they should be, in the end, edifying. Sheesh, how can criticizing Joseph Smith be "edifying" to a believer? And can criticisms of basic church claims be seen as anything BUT "profane" and "blasphemous"? Believers tell us all the time it hurts their feelings too much when critics attack their church leaders. So why even pretend you want to have discussions with critics in the first place? It's a silly game.