Until now I did skim the thread, because walls of text don't mix with ADD, my apologies. Also interesting that Firefox likes the word monolingual but not unilingual.

Evolution: Gradual change over time. There is never any distinction that the change will always be positive. When it's clearly a change backwards it's usually called devolution, so you can consider the addition of irregardless as such. But it's always much easier to make that call retroactively.

Also you read this article as well I take? Or is this just a random coincidence.