I'd say Kirihara; if the troika are right about him (and are any of us daring to say otherwise? XD) he'll be formidible, and possible even if he thought about other options in life (except all he seems to do is play video games XD) he might get scouted and have his future all laid out for him.
With Atobe I tend to think that responsibility comes crashing down on him. He's got to uphold the family name (and FORTUNE). Tennis for him, to me, is the only thing in life he doesn't have handed to him on a plate. Something he has to work hard at, sweat and blister over; and that's just not pretty. But he enjoys that fact. A tangible result to prove his hard work. So I definitely think he'd still continue to play in his free time, to keep hold of that feeling (and sense of freedom).
Re: NEW THREAD: WHO GOES PRO?
With Atobe I tend to think that responsibility comes crashing down on him. He's got to uphold the family name (and FORTUNE). Tennis for him, to me, is the only thing in life he doesn't have handed to him on a plate. Something he has to work hard at, sweat and blister over; and that's just not pretty. But he enjoys that fact. A tangible result to prove his hard work. So I definitely think he'd still continue to play in his free time, to keep hold of that feeling (and sense of freedom).