Two things can be true; the Lakers may be foolish for hiring JJ Redick right now and Redick may someday be a very good head coach. He's got a great mind for the game. He embraces analytics but isn't utterly driven by them. He's a pretty natural teacher. The question remains if he's an effective motivator and if he can be successful wrangling big egos.
Unfortunately, the Lakers job represents a nasty crucible to figure out if Redick has what it takes as a coach. That organization is rather poorly-managed, with a too-many-cooks approach to team building, yet the expectations remain sky high, because it's Los Angeles. It's the Lakers. It's 17 championships and the Celtics just broke the tie. I expect Redick to fail, honestly, but I wouldn't necessarily fault him for it.