Who won? Will it help any candidate?
This answer is answered by this CBS/YouGov poll:
1-bidenmentalhealth.png


The June 9th numbers were just a month before the debate. The only major thing that occurred after June 9th was the debate so I think it's reasonable to say that the uptick and negative numbers for Biden had to do with his debate performance. Even then, having 65% of voters thinking that you don't have the cognitive health to be president is pretty bad. And Trump has about 50% of voters that think he does not have the mental health to be president.

Here's even more relevant polling on the debate performance from the same source:
6-debateperformances.png


If this does not convince voters that we need more options, even beyond the two-party monopoly that we have, then I don't know what will.
 
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Even then, having 65% of voters thinking that you don't have the cognitive health to be president is pretty bad.
this is why I find it so disheartening that no mainstream Democrats have —

Have thrown their hat in the ring, and say they want the nomination,

And they want to be president.