Bernie's chances are a lot better than the media is making them out to be. That's one of their tactics, making it sound like he's already lost so his supporters give up.
If you strip away all the Superdelegates they're already giving Hillary, which aren't even final until July, it's a much tighter race. Not only that, but she's already gotten her wins in a lot of the state's she was strongest in. The remaining states are going to be a much tougher battle for her. The majority of Superdelegates will switch sides by July if their constituents vote Bernie. When Obama beat Hillary, she was leading him 3-to-1 in Superdelegates early on until Obama's popularity among voters caused them to switch sides.
As long as people keep donating to his campaign and keep campaigning for him his support will keep growing. The more people talking about "feeling the Bern" on social media the more undecided voters will be likely to join his side. Because their are a lot of people who would love him if they took the time to hear what he has to say. I can't even count how many people I've brought over to his camp. Siblings, parents, extended family, the cashiers at my local convenience store, friends on Facebook, Twitter, I've convinced people to put bumper stickers on their cars, started a drive on FB asking all my friends to donate just $3 apiece the day before Super Tuesday. Stuff like that.
All it takes is enthusiasm. His campaign is growing by itself at a breakneck speed. All you have to do is add your voice to the chorus.