Its cute you guys think Trump is going to concede.
It won't matter if he concedes or not, he's going to lose by a close margin so there will be no legal challenge. The GOP establishment will finally abandon him as they'll need to get back to actual governance (read: obstructionism of Hillary) and his Deplorables will go back to their day jobs sans a few thousand internet trolls.
Who cares if he doesn't concede, nobody will give him time of day.