I agree with much of what you say... But the change has to come from within, or we will be doomed to repeat the mistakes of the past. 

There need to be changes to existing institutions to respond to popular discontent, but Trump and Bannon's "deconstruction" and "I'm the only one who will  save America" is not the way to proceed. 

Who will make the changes that are needed?

Not Trump, and not the Republicans who made him their presidential candidate. And when you look at the others-- Ryan, McConnell, Cruz and so forth-- I don't see it coming from that side of things either. 

Sanders and his supporters certainly indicate an appetite for meaningful change within the Democratic party, and they will have to work harder and smarter to shape the party in their direction. As difficult as that may be, I see greater potential in the likes of Warren and other Democrats, if they can step up their response to Americans' concerns, rather than let the Republicans win with the politics of fear.