@snood,
Bernie set out to do what he planned and that was to energize the party under Hillary and draw her more to the left.
Now Bernie needs to look to his accomplishments and bow out of the race while trying to remain a viable voice in US politics.
The only way he can keep face is to concede and sooner rather than later.
Concede and then join the democratic party in Hillary's victory, a victory that Bernie can be proud that he helped to shape.