We don't know the future they could ban bitcoin and also ban bitcointalk.org and other websites that supports bitcoin.
If Bitcoin is banned, dead, do we need Bitcointalk?
This is a very apt question.
Very thoughtful indeed.
Let's assume that bitcoin is banned and declared dead all over the world. What do you think will happen to bitcointalk? Maybe, theymos will lose interest and hand over the admin to another person and that person might likely rename the domain and allow the forum to continue existing because of the people therein.
It could also be that, if bitcoin is banned, that will be the end of this forum.
Meanwhile, bitcoin cannot be banned but bitcointalk can. That is why theymos is being careful. Talking about decentralization of the forum. If this eventually happens, how will the moderation of the forum look like. Just thinking