His illness isn't life threatening. There are procedures he can do to relieve the pain (if he really has it).
Meyer isn't a sit at home and play checkers type of guy. He's a grinder. The dude was calling recruits after the national title game at Florida instead of celebrating with his team.
He has a chance to be a top 3 coach of all time. He has a chance to be the only coach to win titles at 3 programs.
Saban is almost 70 and Meyer likely will have 10 solid years where Saban isn't in his way.
He will rest up and at some point he will miss the grind. He will be reenergized and ready to roll soon enough.