I hate the term "if it ain't broke don't fix it" especially when referring to sports uniforms with longevity.
Well to be honest, the look is kinda "broken" if you want to put it that way. We started wearing the current version of the Redskins uniform in 1979. From that point until the last time they won the Super Bowl, their record was 131-77 and a winning percentage of .629. Since the 1992 season, they've had a 138-198 record and a winning percentage of .410. I dunno about you, sounds like they're pretty "broken."
Plus lets face it, younger fans need a uniform to call their own and to remember the Griffin era with. All you older fans have had multiple uniforms to witness, time to pass the baton. And no this does not mean bring back another throwback, lets create new traditions with new uniforms.
If you want to bring the red sox into the conversation, they've introduced a red jersey, a blue jersey, and changed their road jerseys in recent years. So even one of sports most historic franchises have changed their uniforms to some extent.