I think you are missing the point though.
When someone could have been playing a Genasi for the last 30 years, almost the entire lifetime of Dungeons and Dragons, why are we still saying that they are only playing it because it is shiny and new.
I mean, let me put this into context for people. 1991 is an important date in world history. It was when the Internet became publicly available.
Many many many of the Races we are talking about, Tieflings, Lizardfolk, Centaurs, Genasi, Goblins, Kobolds, ect ect ect, have been playable races since before the internet. They are "new" in the same way as the internet is "new". Sure, if something debuted in 3rd, it is newer than the internet, but the vast majority of the options we are talking about are older than that.
So, why is it we are still being told "You like these weird races, but if they became popular and not as new then you wouldn't like them anymore" when most of them are OLD.