Okay, let's see...
First, you can not spot reduce any part of your body. My thighs will always be my problem area. They were the largest part of me when I was a size 3 as they still are now. 
The only way to reduce the size of any part of your body is through cardio. It's an overall burn. That said... the more muscle you have(no matter the location), the more calories your body will burn when you work out. This is one reason why strength training is so important. The other obviously is toning... increase the size of your muscles and as the fat is removed the better your body will look.
So finally... I'd say that if you were looking to increase the muscles in your thighs to aide in the overall calorie burn as well as for toning, this would probably be a very good way to do exactly that! Just be certain to perform cardio as well, otherwise, you end up with strong fat thighs! 
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