This is all so interesting. I have certainly participated in some lemming behavior, but I also get a little turned off if something is SO prevalent that it reaches a saturation point. Although that happens a lot quicker if it was a style or an item that didn't grab me from the get-go. If it's something I love, I usually continue to love it for a while, even if the pendulum swings toward it or away from it. I still have wedge sneakers, and I still like them. And on the flip side of the trend scale, I don't know when cowboy boots have ever trended (before I ever started thinking about these things?), but I have worn them regularly for over 6 or 7 years now. I feel like an early re-adopter of flares and bootcuts because I never stopped liking them for me.
I dunno, everything is so cyclical that if you wait long enough to adopt a look, you'll be the first to sport it before it becomes trendy again. If I like it, I like it and will try to find a way to make it look current. If I don't like it (I'm looking at you, mom jeans), no amount of trend-watching will make me adopt it, and in fact, I'll probably get quite rebellious about it.
All that said, I like that R&B sweater very much, but I've always liked that sporty edge. And I love a good V-neck sweater. I'd probably buy a knockoff if it looked good on me.