Hillary needs to adopt most of Bernie's policies simply because she needs to give people a reason to vote for her, not only a reason to vote against Trump.
It might work this year but what about in 2 years, 4 years, etc? She's too attached to the old way of playing politics and worried about what the polls say. She needs to begin FIGHTING Trump and have policies and ideas that she's firmly behind and wants to implement so the base can get excited. No more of this telling people what they want to hear. All of this news about her going after Jeb Bush's donors.
And that's not me being anti-Hillary. She just needs to know that while she should easily beat Trump this November, her campaign has to be about more than that.