I think the big takeaway and what will really stick with voters here is not even the e-mails themselves. Even if we assume they are "just" regular corruption and Ukraine business deals and Hunter doing "give me money and I can connect you to the POTUS" deals that is not really what I think is going to stick from this story.
It's the Streisand Effect and the massive meltdown over it.
Twitter, Facebook and Google all ran massive damage control. You could not DM the links of the story on Facebook, Google tried to bury the results. Twitter shut down the NYP account and went offline for a few minutes to implement hardcore information control. They used every card they had to control this. In the Mainstream media 7 of the 8 big companies (with the exception of Fox, and even then from what I hear only Tucker Carlson was doing in depth coverage) ignore the story as hard as they could, with a total of only 9 minutes of airtime being given over a entire week for this! Compare this to how long they will spend talking shit about every little Trump mistake.
This is the real legacy of the Hunter Biden e-mails: Not the corruption itself, but the solid proof of a combined conspiracy against the POTUS and a unholy alliance that is willing to stoop down to censorship to try and take him out.