>>Has anyone else noticed that "You're welcome" has been supplanted by "No problem"? You say thank you and they say no problem. When and why did this happen?
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>When Ahnold said "No problemo" in one of the Terminator movies?????
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>Language evolves. Consider how English has been de-sexed over the past couple of decades with, for example, nouns ending in "man" be replaced with something gender-neutral or the use of "their" as a singular possessive meaning "his or hers."
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>I haven't looked for them, but I'm assuming dozens/hundreds/thousands of studies have been made showing how English has changed over the last (pick a number) years.

Wasn't there a humorous quote (often attributed to Winston Churchill) about the Great Britain and United States being two great nations separated by a common language?
Colloquialisms are apt to change rather quickly.