I think if there's no possible path to the nomination after today then drawing out the debate will only harden the positions taken by both sides. As we unify as a nation and hopefully as a world against the pandemic there needs to be one clear message coming from the Dems.
You can't just demand that people agree with
your message in the name of unity and stability. Centrist Democrats have had more than a decade to implement their ideas, while conditions in the nation steadily and then precipitously worsened. I think most people will, eventually, vote for the Blue nominee. But saying that even public
dissent from a party line is verboten; no, I can't agree with that. And demanding silence (oh, sorry, "consensus" (without the consent part)) on critical issues just so as to be "clear" to the public is not exactly endearing me to the so-called moderate position. If you're going to talk like a Republican, don't be offended when you're taken for one. I'm sure Bernie will step aside if things go south tonight, but that doesn't mean anyone has the right to
demand that he give up his platform while he has it, and can still meaningfully push Biden in a more humane direction for a while longer.