"I'm an optimist who chooses to believe in my success against the most overwhelming odds. And also I have a few hundred years left in me to strike down all evil, defeat the Legion and the Old Gods, reconcile the Alliance and the Horde at last, and bring peace to Azeroth. So maybe conditions will be better for a visit a little in the future, so long as the timelines are compatible."

He might just be overselling himself a bit too much, but those WERE his goals. Why aim small?