I am replying to your original topic.
I think you have just right now invented a new area or branch of philosophy, "the philosophy of interest in philosophy".
I don't think philosophy will go extinct. Even with the knowledge attained.
There will always be differences in opinion, even if not in the philosophical questions we struggle with. There might be a debate whether Mary used too much red in her painting of the sunset, or else Peter put too much green in the grass. These differences are not philosophical, but to decide what the answer is, you need to use tools of philosophy, that is, argumentation.
I think philosophy branched out of religion. Man suspected there has to be a rational explanation to everything. If the explanation was not biting him in the leg, that is, if it wasn't in his face, he invented explanations without much evidence. Thunder? God's angry reindeer thumping wiht their hoofs. Lightning? God's wrath, express'd.
Religion was first and foremost a survival tool: to explain the unexplained, and to use its predictive value. Rain dance, blessing of the troops, prayers, sacrifices. When those did not work out, it was easy to explain that the gods were not sufficiently pleased.
Then came the famous Greek guy, whose name I forgot, and he gave explanations to those things, that had been neglected by religion. He said the wind is created by the leaves' trembling on trees; and he made a whole bunch of other EXPLANATIONS that today make laughably no sense, but the damage was done: this guy picked up the slack left by religion.
Then there was not stop to this. Superstitions, sciences, religions, theories, social theories, and legal theories were starting to be based on philosophy. The Christian church declared Plato's writing had the seed of Christian wisdom in the mysticism; scientists questioned the religious teachings; people had a surer way of satisfying their greed with the help of science destroying philosophical empirical truths, that's one of the impeti that empowered Columbus to sail west to find the east.
Karl Marx said that human beings need an ideology to perform a sweeping change in social structure or in other endeavours of society. In personal affairs it's called "rationalizing the cognitive discord (or cognitive dissonance)". In social movements, the rationalization is replaced by ideology, and the cognitive discord or dissonance is replaced by facing the changing of societally accepted values. Marx recognized this event, and that this is a social law. We need to defend Christianity, was the motto for the Crusades, which aimed to gain an access route to India's wealth of spices and gold and jewels. We need to fight for freedom, for liberty, and for justice, was the slavekeepers' motto for ridding themselves of the king's rule in America, and the proletariat-oppressing, internationally expanding imperialism of the bourgeoise in France. We must bind up the broken, the ill, the lonely, the poor, we must eradicate slavery, was the Christian motto for establishing a hegemony of absolute power in Europe in the middle ages.
Once social stability is achieved, we won't need ideology, either.
In all, philosophy was an excellent tool to pave the way to secular thinking, which paved the way of man detaching himself from the rigors of the unbending dogma of faith. It was also an excellent outlet for man's curious nature, and for his obsession to find solutions to problems, theoretical or practical, same difference.
But like you pointed out, Jack Cummings, will philosophy survive if it loses its survival value?
As a study of something that has historical value, no. It won't lose its stance. But as a tool of secular detachment from religion, it will use its usefulness. Things that are no longer useful get sidetracked, and their only way to survive is through their value of novelty, curiosity. The "strange and curious" survive no matter what. And as such things go, philosophy is sure one of them.