Natural hair is not a trend. "going natural", that's the trend.
Right now, alot of women go "natural" because they feel it's okay to now. They see lots of other women doing it so now if they do it, they won't be the only one and won't feel so out of place. And also they see more and more acceptance of it in the workplace and public sphere.
But ALOT of women are going back to either having relaxed or straighten their natural hair. Because after awhile for them it is not what they thought it would be. This by the very nature is a "trend", something that mainstream begins to follow for a limited amount of time because at that time, it's the thing to do.
Having "natural hair" for some women is becoming a trend. Looking back at history, it turned out to be a trend in the late 60's - 70's too when everybody was wearing Afros. And they too thought back then that how your hair was growing out of your scalp, you should wear it that way, and they did.
And then in 81, the relaxers came back with a vengence. And everybody accepted it. Please, let's not delude ourselves, most people are not as serious about hair care as LHCF, so for some natural hair or "going natural" is a trend.