The first eleven Super Bowls kicked off at 3:30ET and then for money reasons they shifted it to the usual past six o'clock time. I think what's going to happen eventually is the NFL season is going to start a week or two later so the Super Bowl will be played on Presidents Day weekend.
I don’t understand why they don’t move the game to Saturday night if they want to start it so late. People could enjoy their parties a whole lot more if they weren’t worried about getting up for work or getting their kids to school the next morning.