The time is now.
Just go, go, go, we don't care how, Bernie, but it would be nice if you went with grace, positivity, and a proffered acknowledgement that the Democratic presidential nomination now belongs to Hillary Clinton.
Because in the end Hillary did win the primaries fair and square. She won the popular vote and the delegates awarded based on the votes of the people. Even if there were no super delegates involved - super delegates being those who can vote for whomever they want at the Democratic Convention regardless of how the popular vote went - she'd have won, because if super delegates didn't exist she'd have needed only 2026 pledged delegates to win the nomination (see reference below). By last night she had won 2196 pledged delegates to your 1866.
So, you see, Bernie, the super delegate system was not in fact rigged to Hillary.
And yet after all your complaining about super delegates overruling the voice of the people, now that you've lost you insist that the election isn't over because, you say, there's still a chance that the super delegates who've pledged to Hillary - and who are not required to (but usually opt to) represent the voice of the people - might change their minds and come over to you and give you enough delegates to win the Democratic nomination. In other words, you seem to have no problem with the super delegate system overruling the popular vote if you could get that system to work for you. In other words, Bernie, you are now the one who's attempting to rig the system in your favor.
Not cool, Bern.
When Hillary lost to Obama 8 years ago - and in an even much closer race than yours and hers this time around - she graciously conceded and called on her supporters to now give their support to Obama for the good of our country. Your current behavior, Bernie, is more in line with the woman in the Bible story who, if she couldn't have the baby in dispute, preferred to have King Solomon cut the baby in half rather than hand it over to it's rightful mother (1 Kings 3:16-28).
So what do you say, Bernie? Would you rather see our country thrown to the dogs than to hand Hillary her rightful victory?
Or is there maybe some other dynamic going on with you?
Bernie Sanders, years ago you left the noise, conflict, and social turbulence of New York City to settle in peaceful, quiet, white, affluent Burlington Vermont where you were elected mayor. Then you moved on to Congress where you were happy to let your fellow representatives duke it out while you stood stubbornly off by yourself on your principles and accomplished more or less nada.
Nobody had heard of you before you came seemingly out of nowhere and jumped into the presidential race. Could it be possible that on some level, conscious or unconscious, your real reason for staying in your lost-cause of a race is because after all your years of anonymity now you can't bring yourself to give up the power, exhilaration, and roar of the adoring crowd?
Best to go now, Bernie, before our love curdles.