At 6'7 he would be a gangly peter crouch. He would not be effective. It has been found that the optimum size for a football player is about 59-5'10... There some oddities, like Kohler who was the number 9 for the Czech Republic years ago, who was 6'8... But his height did not really make him a superstar. If height conferred an advantage, the Dutch, who are the tallest Europeans, would not have a team that was smaller than Japans...
The problem on the other hand, arises with teams like South Africa that are undersized. In Africa, people in Southern and Central Africa carry Bushman genes which make them smaller than West Africans. The difference in size, accounts to a large extent, for the disparity in football accomplishment between the two regions. Southern Africans could become more competitive if they targeted bigger people to play the sport...