Just a few comments on different parts of what you said:

1. Battlefield Earth has already sunk under its own shittiness. If you were to ban or censor it, it would just arouse interest in something that will be out of print as soon as Scientology dies out (it's likely that a new challenge to its tax status will sink it eventually; once the tax dodge is gone the religion will be unfunded and disappear).

2. Nietzsche as mandatory reading would be fun to see. I doubt it will happen, though. He's far too controversial. Imagine little kids in Mid-America telling their parents they're reading a book called Der Antichrist.

3. I think Foucault's Pendulum is a fun book, but it is nearly inaccessible to the majority of the population of the planet due to its esoteric subject nature.