Bitcointalk isn't a company. It's not operated for the sake of turning a profit and doesn't require revenue to continue existing; at least not for decades, or maybe even longer.
Bitcointalk is not a company and a forum without traffic is not a forum, it is a relic or a ruin, like the Roman ruins that people visit, not a forum. If hypothetically tomorrow there will be no more traffic on the forum, it will surely continue to survive because it will not need money, but it will not be a forum, it will be a ruin.