First of all, fair use is not a set of guidelines, it's a legal doctrine that allows us limited use of copyrighted material without permission from the owner. It is a part of the U.S. Copyright Act, which is a law enacted by Congress.

Second, fair use has been seriously challenged plenty of times, just to name a few:

• Campbell v. Acuff-Rose Music, Inc.

• Authors Guild v. Google, Inc.

• Lenz v. Universal Music Corp.

I recommend reading this article by Kit Walsh, who’s a senior staff attorney at the EFF, a digital rights group who recently won a historic case: border guards now need a warrant to search your phone.

Fair use protects creativity, innovation, and our freedom of expression, but You almost sound like you want it weakened.