How have you come to the conclusion that you are the only one?
I would bet you quite a lot of money that you won't be alone.
Anyway, IF it was the case, i'd say it would be a very nice flight. Lot's of space to stretch out. A seat for looking out of the window, a seat for sleeping, a seat for lounging, a seat for dinner, a seat for snacks, a seat for drinks, a seat for breakfast and plenty of backup seats for other shenanigans.