The human brain does have a limit.

Sure does. Even if new learning methods are proposed, and implemented, man will eventually reach a point where he can no longer advance in logic because he simply cannot learn everything else beforehand. In order to advance in knowledge, one would have to learn what has already been discovered by his predecessors. Eventually, learning and retaining all this knowledge would take a lifetime. Sure, we can hope for loopholes around this, like a "fountain of youth" or an extremely fast, perhaps technological, method of learning, but I doubt anything like that would occur. It also poses the question of "Can the amount of information a brain holds be limited physically?"

I discussed this with Ray Kurzweil who believes of course that we will eventually live forever. I remember by third year physics courses in college and my professor saying that what he was teaching us he did for his PhD thesis some years before. In Einstein's day, it was thought that a physicist did his best work between the ages f 23 and 28. Now a physicist doesn't even have enough knowledge to begin meaningful work until 35 or so. It's a fascinating subject.