Kenology on 11 August 2008
Miyamoto has been training so many younger people to handle development duties. Nintendo will be fine.
Also, Miyamoto hasn't officiallydirected a game since Super Mario 64, I believe. But he was knee deep in development of Ocarina of Time, even though he was only credited as producer. When Eiji Aonuma was having trouble with Majora's Mask, Miyamoto stepped in and put the project back on track. He's way more involved in many of EAD's projects than the Producer title would suggest. He was also credited with the concept and game design for Super Mario Galaxy I believe.
But yeah, back to the main question, Ninty will be fine. And also, Miyamoto isn't going anywhere anytime soon.
