Might be the wise choice. Trump thrives on turmoil, spur of the moment decisions, and endless "false" positions while he keeps everything in flux until he must. That cannot be easy to work with. And Ryan is much more planned in style.

Sets him back to private life with 5 years to decide about the Presidency (or sets him up to run in 18 months if Trump punts it for some reason). He is neither a Trump supporter in GOP eyes, nor unwilling to work with the TEA side of the house.