Reminder, we won't have a nominee until the convention
Even then, it really isn't over until election day. If Clinton wins the nomination at the convention, Sanders can just keep running until election day. But wait, the electoral college doesn't vote until January 6th, 2017. Sanders could convince just 270 electors to switch their vote and back him for president instead. However, this really isn't over until Chief Justice swears in the new president. Sanders could convince the president elect to step aside and have the Chief Justice swear Sanders in instead. But actually, it isn't truly over until the new president moves into the White House. Sanders could convince the public to block all roads to the White House where the newly sworn in president is planning on traveling to get to the White House. Sanders could then slip in the back entrance and take over as the new Emperor of America.
See it isn't even close to being over. They want him to drop out almost a year before this thing is even close to being figured out. This is the height of ridiculousness! At least give him a chance! Give him another year to sort this out!
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You are ignoring history and want special rules just for Sanders. In every primary contest since the creation of super delegates, the winner was declared the presumptive nominee based on the inclusion of super delegates. That fact that this is not favorable to Sandes does not matter http://www.dailykos.com/stories/2016/5/29/1532358/-What-Does-It-Mean-to-Clinch-the-Nomination-When-Superdelegates-Are-Involved
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The answer: history says the first person to get to the magic number is the presumptive nominee, and says it unambiguously, even if the losers often disagree.
Here’s how it has gone since the superdelegates were added to the process.....
Summary
Anyway, I started this research 12 hours ago to answer a question for myself, so that as everyone on TV is spinning things this way and that on June 7th I have some context. What, if anything, have I learned?
First, most non-incumbent candidates have needed superdelegates to win, and the history of superdelegates has been that once a Democrat hits the magic number and becomes the nominee, superdelegates are more likely to flow to the nominee than from them.
Also, in the history of the superdelegates, they have always ended up supporting the decision of the pledged delegates, and their most important contribution has been to amplify leads of the pledged delegate winner so that they can be assured success on a first ballot, and avoid the sort of messy convention that harms a general campaign.
The major thing I’ve learned is that the press declares, and has always declared, the winner after they hit the magic number, and has done so in far more nebulous circumstances than this. Even in 1984, in which Hart won by a number of other metrics, in which the delegate count was the arbiter, and Mondale announced himself as the nominee, even with 38 percent of the popular vote to Hart’s 36 percent—even then, Hart may have claimed he still had a cunning plan, but no one begrudged Mondale the fact he was, for all intents and purposes, the nominee.
When you think about it, that simply has to happen. Things need to get done, and they need the nominee to do them. Except for Reagan in 1976, who chose a running mate after Gerald Ford was made the nominee, there aren’t a whole lot of non-nominee candidates going to the convention with their own vice president picked out. You get to do that because the numbers say you’re the nominee.
Meeting this number also allows the nominee to do the work of campaigning before the convention, establishing a message, building capacity on the ground, etc.
The press, for its part, has always understood this, from 1984 onward, and has named the nominee (or the “presumptive nominee”) the minute the candidate crosses the line with their combination of pledged and supers, and usually said something to the effect that they had “clinched” the nomination. They did that when Mondale had won far fewer states than Hart. They did that when Dukakis did not have 50 percent of the pledged delegates. They did that when Obama had not won the popular vote (yes, I know, Michigan—I hope we’re still not fighting this?).
This is a well researched article and confirms that the nomination process will be over on Tuesday June 7, 2016 when the results of the New Jersey primary are announced.
My wtf meter kept getting higher and higher and then I laughed. Still am. Great job. 
