My suspicion is that it will open the game because teams would prefer to attack and keep the ball away from the danger zone. If penalty kicks become to successful though, FIFA might decide to make it more difficult for the kicker instead of going back to the previous chaos. Examples are:
1. if the goalkeeper reflects the ball, nobody can approach it and try again.
2. the goalkeeper could be allowed to leave the goal line and meet the ball.
3. the goals could be made narrower.
What surprises me is that, for the VAR, they didn’t do what was done in other sports (tennis, field hockey, cricket): only review actions on request by a team (or the referees), and give each team a limited number of times their requests can be rejected.
IIRC, American football has that now, too, after a period in which about every play got reviewed.