I think some people vote due to aversion to certain game mechanics. And some people vote because of appearance, or feel something is too cliche.
Bladeling - ugly, pointless (no pun intended)
Bullywug - these weren't even meant to be PC
Drow - Drizzt, cliche, darkvision, perceived evil, perceived overpowered
Revenant - some people just don't like undead as PC's, and feel strongly about this.
Shadar-kai - see Bladeling
Wilden - I guess plant-men sounded boring, or maybe too weird.
I actually don't mind Drow and Wilden. I think they are both interesting enough to add some color to a game, though I can understand they are not for every game. The rest I could do without. I can see how one might be drawn to Revenants as a concept, but it's not my cup of tea.
Predictions? The sky is falling and the end of the world is near.