You know, I have had many more plane flights and other close-quarters-type experiences ruined by insensitive adults than by crying or restless kids.
The guy behind me who talks to his seatmate the entire flight, regardless of the time of day or night. And his cousin, the guy who opens and closes the seatback tray table 150 times. The two drunk business travelers across the aisle who burst into laughter every five seconds. The guy who grabs your headrest - or your shoulder, even! - for support while walking down the aisle. The fan in the middle of the 20-seat row who makes two beer runs and two pee runs per quarter. (Hey, stay in the concourse, you'll see more of the game.) etc etc. Not to mention the guys who puke, pee, etc right there in their seats.
Give me a one-year-old any day.