Wear 'em if you want. Anybody who would judge the band on it's fashion merits (i.e. "in" or "out") doesn't really understand what the band is about. It's not a fashion accessory - it's significance goes much deeper than that.
I bought a few bands several years back but no longer wear them. I just don't like to have unnecessary things around my wrist. But I see people who still wear them. And anyone who would negatively judge someone who still wears the band as "unfashionable" really needs to gain a new perspective on life.