It hasn't stopped me either but we aren't casual NASCAR/race fans.Maybe it's just me but the temperature at a track, hot or cold, has never prevented me from going. I won't go to most night races any more because it's become too long a day for me, and often requires an extra night in a hotel. Again, just me.
I'm not sure what you mean by 'optics'. The sight lines aren't going to be any better night vs. day. The infield buildings will still be there. The inability to see is what's kept me personally from returning to IMS, far more than the weather. Moving the race to night won't fix that.
And by optics I mean a frontstretch that is relatively full. I realize that they are not getting a full house anymore, but they can maximize a way to get the frontstretch relatively full and back to 60-75K like many of the other crown jewel races (Daytona 500, Talladega, Bristol Night Race, Coke 600 still do that from what I see). It looked like there was a fair amount of people in the grandstands under the shade this year.