I think the path for CP3 is pretty clear. He returns this season with a role reduced to about 15 min/gm, maybe 60 games. No matter how great Mitch Williams can become, I think he'll need all the help he can get developing and maximizing our three-guard rotation around Wemby this season, and who better than CP3 in this role? ... seriously, 2nd best is not close. I also think developing Fox into an elder statesmen is worth pursuing too.
So one, two more seasons tops for CP3, then retire John Elway style and move directly to asst coach gig where he'll start prepping to become a head coach - get some ojt and refine his style, learn how to work with FO, and in an upfront fashion start developing a coach or two to take with him to his head coach gig a year or two down the road. Hit the ground running!
All this speculation aside, maybe CP3 does not want to coach, but given the current state of coaching salaries and CP3's young age, he's almost assuredly sitting on an option to cash a check for $200M over the span of his would-be coaching career - doing what he loves.