I don't fly for the fun of it. If I look forward to an upcoming flight, it is because I am excited about the destination. Even if TSA disappeared and U.S. carriers were to return to the days where seating was more spacious, there was a decent chance you could get an empty seat next to you, and upgrades were easier to get (for me), I doubt I would ever book a flight somewhere just because I thought it would be fun to spend some time on a plane. Being on a plane is just too confining overall.
That said, I sometimes enjoy the flight once I'm on the plane. If I have an empty seat next to me, the odds of enjoying the flight are good.