Why does anyone care whether he concedes or not??? Just let the electors vote and that will be final. On inauguration day, if it's Bush on the stand, it doesn't matter even one tiny bit if Gore is out in the crowd loudly protesting that he is the president. There is no gain for him to concede, and always the chance, unrealistic as it may be, that lightning may strike and he may win the White House... Why stop running before the end of the race. The president is not selected until the electoral college votes.
IT DOESN'T MATTER...