Tiger will be around for more than 8 to 13 years. Vijay won majors after 40, and Tiger is in a lot better physical shape than Vijay is. Jack Nicklaus, same boat... Tiger will still be a threat in major championships after he's 45 years old.

As far as the next big thing in golf, there may not be anyone ready to take over for Tiger. Maybe it'll go back to being anyone's game. Look at the pre-Tiger era. Nick Faldo, Nick Price, Greg Norman, Ernie Els, etc... all had their time at the top before fading slightly.