Segnosaur
Penultimate Amazing
The number of people who would be concerned about such issues is relatively small (a few people involved in the medical/psych field, perhaps some sociologists), and they should be more than capable of dealing with the differences between common usage of the term "pedophile" and the more clinical definition.Sure. However the problem I see is not that languages evolves, but that language is misused in a way that makes it very confusing. When someone who likes 15 year olds is called a pedophile, it effectively lumps all of them together, but the causes of their "preferences" and the treatment are different, when they're needed at all.
Similarly, lumping "bigotry against Mexicans" in with "racism" is something that would be convenient/useful, and attempting to stick to a more technical definition (subdefine bigotry by subtype - race, religion, nationality) would be useful to only a tiny number of people and inconvenient to the rest of us.