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The Democratic establishment and the Clinton campaign are starting to urge Bernie to drop out. They say it is because Bernie can't win, but there are other, much more important reasons why they want him to drop out and why he shouldn't.
Bernie's campaign is pushing Hillary's campaign further to the left, where she does not want to be. She is not a true progressive and it makes her campaign nervous when progressives push her beyond her comfort zone.
Another reason they want Bernie to drop out is because his campaign reveals some very serious problems with the Democratic Party and its system of nominating candidates. If you take away the superdelegates, Bernie would be in the lead. The longer Bernie stays in the race, the more people will see how corrupt and undemocratic the superdelegate system is. The Democratic Party and the Hillary campaign don't want people to question that system more than they already have. Superdelegates will decide who the nominee is and that makes the Hillary campaign look less legitimate.
Another reason why Bernie needs to stay in the race is to spread his message to more people.
And polls still show that Bernie can beat Trump and Hillary can't. That could change over time, or maybe not.