Statistically speaking, though, given that the last election was decided by 80,000 voters in three states, it kinda does matter.
As the article you linked to points out:
"If the candidates don’t win over new voters, a debate can be significant for hardening the support of voters who are already inclined to back them"
This could affect turnout.
A snowstorm and continued evidence of Trump's mental instablility in tonight's debate could have statistical signficance.
FYI, this site tracks current voting trends (note that not all states provide info on the political affiliation of those who have already voted)