I think you'll see this type of onside kick regularly the rest of the season. When they changed the rule requiring an equal number of players on each side of the kicker, it was done with player safety in mind, to avoid the massive pile of players crashing into each other with a 10 yard running start on onside kick attempts. (Even Moose Johnston, who played special teams throughout his career said the onside kick is the most violent play in football.) This type of kick, because the ball moves slower, allows more players to close on the ball and get involved in the play. The fact is that, other than Zuerlein, the Cowboys players did not execute the play properly. I'm sure the design of the kick did not include a plan for the Falcon players to be mesmerized, but they just stood there looking at the ball until it was too late. To properly execute the play, the Cowboys players should have been blocking them away from the ball. The kicking team can't touch the ball until it goes 10 yards, but they can certainly block the other team before the ball goes 10 yards. They should have been blocking for the ball as if the ball were a ball-carrier trying to reach that 10 yards. This type of kick probably negates the purpose behind the rule change. A slow kick=more players involved, some of them getting a 20 yard running start.
This is just my prediction on onside kicks going forward the rest of the season, until the rule committe outlaws "watermelon" kicks.