As everyone else here has already said, there is still a lot of work to be done in philosophy. I think Dr. Ghate’s comment should be taken in precisely the context that he specified for it: that of changing the culture. He didn’t say that no new innovations are possible in philosophy–only that such innovations are not what’s needed to changed the culture. Further, since I think Ayn Rand identified almost all of the basic principles, I think one could say that Objectivism is basically all the philosophy that the layman needs. What remains to be done in philosophy (much of which will be technicalities or minutiae compared to what had already been done by Aristotle and Rand) will be plenty to occupy professional philosophers, but will not be of that much direct interest to anyone else. The one major exception to this that I can think of is the problem of induction.
Let me ask all of you this: Do you think it would be correct to say that Objectivism exhausts metaphysics, and perhaps to a lesser extent ethics and politics (I think most of what remains to be done in those fields is just polemical), and that most of the philosophical work left to be done is in epistemology and esthetics? It seems to me that those are the two branches in which Ayn Rand explicitly left the most unanswered, although even there she did provide the fundamentals.
Do you think it would be correct to say that Objectivism exhausts metaphysics, and perhaps to a lesser extent ethics and politics (I think most of what remains to be done in those fields is just polemical), and that most of the philosophical work left to be done is in epistemology and esthetics?
The best answer to this question is another question: what are the unanswered questions in each branch?
Another question to ask: Can we rule out the possibility of asking new questions in the future?
The answer to the latter is a firm “no”, which is why I don’t think philosophy (or any theoretical field) could be described as “closed” or “exhausted” – meaning there are no new discoveries to be made. Until men are omniscient, nobody can claim to know everything, which is what would be required to say that there are no more questions to ask.
Periodically in the history of physics, the consensus was that the field was ending, and that all remained was wrapping up loose ends. This was the case at the end of the 19th century. Then along comes this patent clerk to spoil things with talk of things like “relativity.”
There are popular physics books today with names like “The End of Physics” proclaiming the same thing. So maybe the day is approaching when someone will sweep aside the status quo and push forward the field once again. Maybe it will be a big new theory, maybe a new Little theory.
If it can happen in physics, I don’t see a reason why it can’t happen in philosophy. Some day, when John Galt is re-elected to the White House, some young thinker may come along with questions that haven’t been asked before.
By the way, isn’t it interesting that when people first dig into Objectivism and find that Ayn Rand answered so many of the long-standing “big issues” in philosophy, they often ask this question? It is a hasty generalization to go from correctly answering many to correctly answering all questions – and not just known questions, but all conceivable ones.