Alexander's Future
Would he be able to rebuild and educate society with the help of the library assistant?
shareI think he could, but there wouldn't be much he could do within his lifetime. He would have to set up a base of apprentices and have them carry on the work after he died.
They had a similar ending in the old 1960s Disney film, where when the time-traveler finished telling his story to his friends, he went back into his library, took a bunch of books, and went back into his time machine to the future to help the people there, and the friends he had talked to in the present could only speculate which books he took back to the future to help him and the Eloi.
To be fair, despite the cheesy special-effects, the 1960s version was actually better told than this version.