I like this idea because there is less to buy at the store...I don't need to buy sour cream. Anything that makes shopping faster makes me happy! PLUS, I know we're getting something good because the yogurt is organic. You don't get all those live, active cultures in sour cream!
If you haven't noticed, organic plain yogurt is pretty versatile. For example, you can also make dip with it instead of sour cream. Like this taco dip or this ranch dip.
So, get with it! Toss out that sour cream and buy yourself something good.