the democrat party have to go bold and trust the voters to pick the winner

We've got upwards of fifty people threatening to throw their hats in the ring. The press will publish stories about all of them, judge the reactions and favor those who get the most clicks/views/buys with more stories.

The action right now favors Bernie and Beto, Socialist vs Capitalist.

Berniebots(Socialists) are getting in some early blows to try and knock Beto out before the race starts. Beto may be progressive but he's a capitalist. All capitalists are the enemy, regardless of party.

things have been getting incrementally worse for decades now on every front.

No, they aren't. The ACA has led us to a place where Medicare For All might become a reality. Gay rights have made remarkable strides. An increased federal minimum wage hike is on the horizon and is becoming a reality in many cities and states. Free college tuition and student loan reform has entered mainstream political discussion and is becoming a reality in many nations as they realize that an educated populace is the key to the future.

I see a democratic sweep coming in 2020. And I think, despite sustained attacks by the socialists, his is the name most likely to catch fire among liberal and progressive(capitalist) voters.

We seldom hear much about Bernie's many and glaring weaknesses were he to become president. He has no interest in race and gender issues. He has no interest in foreign policy or diplomacy. He has a deep understanding of a handful of domestic economic issues and beyond that he's pretty much an empty suit. We owe a lot to Bernie but I don't think we owe him the Presidency. Any more than we owed it to Clinton.
Good coffee, good weed, and time on my hands...