It's a hard life being on the road and I don't blame him for wanting to cut down a bit and refocus. I don't know him but from what I've gathered he seems very competitive and eager for both a challenge and for perfection. It could just be that he feels that he has (for now) done all he can with his talent.
It wouldn't surprise me if he did indeed come back after a few years off the big circuit. It would also not surprise me if he came back as a chef d'equipe or trainer, taking on a new perhaps more interesting challenge.