No, you are wrong, because then he would just be paying money for outdated technology. He has an AGP video card.
What he has is just fine, and even if he did get a new Mobo, he may have to get new RAM, a different proccessor, a whole new computer.
Really, 256mb of RAM is 25 bucks, and the 6200 is 65. 90 bucks, and he wont have a half bad computer for basic gaming and productivity.