Extending a prospect who has never even played a game at the Major League level is quite the risk, but if I were the St. Louis Cardinals, I would be exploring that right now with JJ Wetherholt.
I don't think many people would disagree with this, but in my eyes, Wetherholt is the most important player in their entire organization, and it's not all that close to me. No, it's not fair to place too lofty of expectations on him, but part of the reason I would be looking into a long-term extension with Wetherholt is that I believe there is a high enough floor that things will still go well, even if he doesn't hit his ceiling as a prospect.