When Are New Standards Worth It?

What kind of performance gain actually merits making “old” parts obsolete? Or to put it another way, how much better does a widget have to get in order for you to stomach the hassles created by a new standard?

• I’m completely fine with standards changing. Things change. Get over it.
• I’m okay with standards changing, but only when they introduce game-changing gains in performance.
• I wish standards didn’t change, but if they make components or bikes even a bit better, it’s worth it.
• I don't care how "rad" the widget is--I don't want to see another new standard. Period.