You mean like Clinton didn't concede in 2008... Bernie's message should not, cannot be shut down.
And whatever the results of the primaries, she will remain the cagey politician she has always been, not unlike Bill.
Even the NY Times, while congratulating her on the win (and endorsing her) has said in editorial that she if she wants to be accepted by the Sanders supporters she must be more open about the questions regarding her relationship with Wall Street, etc.
This is not a personality contest, it is SUPPOSED to be a debate of ideas.

"The liberals can understand everything but people who don't understand them."
Lenny Bruce

"The cleverest of all, in my opinion, is the man who calls himself a fool at least once a month."
Dostoevsky