Exactly! It's the Q-tip factor.
And to be even more achingly, annoyingly, boorishly pedantic, I'd say that the term "tree" isn't a true "Q-tip/Kleenex" moment. Those were situations where a brand became so popular, that the brand name became the generic term.
For example, the NFL is so dominant, that a lot of people forget that the NFL is just a league, and that the sport is football. There have been other football leagues like the XFL and Arena Football.
This is also kind of happening in the sport of Mixed Martial Arts (MMA). The UFC (Ultimate Fighting Championship) is the largest league at the moment and for a while, the media was flirting with calling MMA "Ultimate Fighting." Thankfully it didn't stick.
Anyhow, if the Q-tip/Kleenex factor were to happen in regards to mono-colored, non-articulated, mini-figures, I think it would be more akin to a super popular example of the style of figure becoming the generic term for all mono-colored, non-articulated, mini-figures. It would be like calling all mono-colored, non-articulated, mini-figures MUSCLEs.
Referring to MUSCLE family molds, runners, sprues, and groupings of sculpts as trees is not quite the same thing, really. That was more of URS just coining a simple term to describe a fairly complex thing.
Anyhow, I'm not trying to prove a point or anything. I'm just blabbering about this cause it has my interest peeked at the moment.
Edited by Soupie, 09 February 2011 - 09:42 AM.