If you're looking for an opinion on the trade, it is very, very, one sided, on the surface.
There is room for debate on this though. There's no guarantee that Crawford will hit like he has all season nor Baez remain the closer. If any of these scenarios play out and Fullmer or Hunter break out in a big way then it could swing the trade to the Fullmer/Hunter side. I'm a big Crawford guy, though, and I find that the Fullmer/Hunter side will even make it close doubtful. I don't know if I'd veto it, however, because there can be a case made for the other side. For league harmony, I'd let it pass.