The discourse around Biden exiting the race is moot because the only one who decides if he continues is Biden. Biden is still running so nothing changes. Biden is who we need to vote for to keep our democracy.
Biden had a bad debate performance. It was a missed opportunity to pick up new voters. Biden demoralized his base. But we're still stuck with him, because there is no external mechanism to stop him from running.
The most effective tool we have to prevent the christo-fascist takeover this November is voting. The debate did not change that.