To be honest, Jesse, it seemed to me that, as Porter said, you were just trying to be difficult and didn't actually want to have a real discussion.
I would think that, as a lawyer who takes precision in language so seriously, you would recognize that words can mean different things in different contexts. Saying "Welcome!" to someone who comes to your house is not the same as saying "You're welcome" to someone who thanks you for something. The word has different—and quite distinct—meanings in each context. There's no blurring of meaning here, but rather specialization of it.
The whole idea of language reverting or progressing is something of a fallacy. Language changes, but not necessarily for the better or the worse. Language change is balanced by the desire of speakers to be understood and the desire of listeners to understand. I don't believe there's any way a language could actually devolve into grunts, because then both speakers and listeners lose.