See: inversion of the meaning of the word “literally”

That's a great example of a word being misused. If the way a word is used makes its meaning less clear than before, it's being misused. Since "literally" can now mean "figuratively," you don't know how a person means it without additional information. If a new word came about to mean the opposite of "figuratively," all well and good, but without it, meaning is being objectively obfuscated. Another word that suffered this fate is "nonplussed," which means "being so surprised and confused a person doesn't know how to react," but is commonly used to mean "unperturbed," its opposite. Because of this, it's usually recommended to just not use it at all, because nobody can be sure what it's supposed to mean.