I can see Twenty20 offering injury prone players a way to continue their careers long after their Test career has ended. Sure, it is intense... but a bowler only need manage 4 overs. What is a batsman typically going to face? I haven't paid enough attention to even make an informed guess, but the answer is basically "not many".

I can see Gilchrist, Warne and McGrath carrying on for several more years in Twenty20, and injury afflicted players giving up Test cricket to extend a career in a form of the game that puts rather less strain on the body.