Just read Capital in the 21st Century in French. It will do the trick and keep you occupied the next two years.
I read Piketty's book in English (I speak French but don't read it well enough to understand complicated stuff like that), and I've read some of his scholarly work. I find that his writings tend to overstate the case, but his public talks and speeches are a lot more levelheaded. Anyway, I think there's a very Mustachian lesson to take away from Piketty. Let's take his presentation of his findings at face value, namely, that the rich keep getting richer, because investments (i.e., capital) grows faster than the economy as a whole. The average person's response is to whine about it, claim that it's unfair, etc. Typical complainy-pants behavior. I think a more Mustachian response is: "so the rich keep getting richer, and they got that way by investing in and holding capital--I better get me some capital!"
tl;dr, the Mustachian response to Piketty's book is to do exactly what MMM says: invest as much money as possible into productive assets, and let your money work for you.