Continuing Grammar

Considering that I'm at a nerd camp, it goes without saying that the collective grammatical capabilities of everyone here--staff included--is not particularly impressive. They might be able to do integrals just a hair slower than Mathematica, but they aren't always grammatically correct. One particularly annoying misstep that I've heard from numerous people of all genders and ages is the use of an adjective in place of an adverb. Mistaking "good" for "well" is understandable, considering how deep this error has percolated into the diction of society. But "perfect" instead of "perfectly"? "Quick" instead of "quickly"? That goes a little far, and there are more too. I'm predicting the decline of the "-ly" suffix in the future of the English language. Considering how much inflexion the language has lost ever since it split from proto-Germanic, this transformation would not be surprising.