Obama had the momentum in 2008 that Bernie has today. Some of the reasons why detractors thought he wouldn't be successful (male, foreign born, possible drug use, etc) were used to smear his campaign. Still, the American people elected Obama and reelected him to office because we are willing to overcome our differences.
Similarly, we can see that establishment party bosses are not seen favorably in 2016. The best move for Bernie and dems is to look for issues which many people support and try to identify with people who have historically supported those ideas. If you can think outside the box and still find common ground with independents, without losing democrats, you'll win the nomination at the DNC.
For decades voters have looked for a candidate with family values. Your best bet is probably a non-custodial parent. A non-custodial parent probably has a family, but is willing to put America and the American people first. A democratic socialist is a great way to show people you care by delivering social services on the basis of need, and requiring from wealthy people a higher level of contribution. The candidate who is the best fit exemplifies this need/ability relationship. Non-custodial parents need jobs, and they have the time to commit to those jobs. So the non-traditional candidate who can tie in votes from black voters, young voters and liberals is someone who represents a familiar quality of standing up for what's right in communities. Bernie should be looking for a qualified VP right now, though I doubt he will make it past the convention so it likely won't matter.
I think your question is impossible to answer. You are trying to tie Bernie into an establishment that wants his votes, not the values of his constituents. For someone who has given 0 likes, I find it interesting that you think the DNC has made concessions for Bernie.