I think breakneck speed, size, and athleticism are perhaps overrated a bit. Players that possess those traits have higher upside from a physical standpoint, but other factors (a motor, skills, anticipation, and preparation) have a big impact on the outcome.
Take the example of Tyson Chandler - Physically, he should dominate on both ends of the court with his all-world size, length, and quickness, leaping ability, overall athleticism. He never developed his footwork, a go-to move, a jump shot, etc. I wouldn't be surprised if Jerome Jordan would regularly take him one-on-one.
Lots of examples of less-than-perfect athletic specimens have made it to all-star games - and plenty of others succeed in big-minute roles with less than ideal physical tools.
It just means that Lin's skills and intangibles need to be top notch to overcome relative T-rex arms. :)