Disagree. A Trump/Biden debate probably doesn't move the needle much at all for anybody. Trump's brash refusal to debate with civility looks as good to his base as it looks bad to Biden's. I don't see a point. It only gives Trump air time he doesn't deserve.
The people who love Trump debates love them because that is how they debate at family dinner. Biden supporters hate Trump debates because it reminds them of the dinner table debates they had to deal with.
I think they're already on "our" side though. The only people really still on trumps side are the brainwashed faux news/Facebook addicts that will never "see the light" and the conservatives that absolutely will never ever in their entire lives agree with what Democrats want. They'd rather 4 more years of "what did this nutter say on Twitter this time" than to allow Democrats to enact policy, which I understand in a way because that's how I saw Biden. I'm happy to have been wrong, but I was ok with 4 years of the status quo with no progress as opposed to a Trump dictatorship.
Those previously mentioned conservatives just refuse to believe that Trump will try to bring on a dictatorship and the wrestling match that is a current day debate won't affect that thought.