I think that if they stopped now, even if it was because they realized that the only way to get their cutie mark is by finding themselves and waiting for the right moment, it would feel like giving up, and that is the wrong message of the show.
Instead of just giving up, they should take a different approach. The point of a cutie mark is finding out what you want to do with your life, so instead of doing crazy-ass adventures and shit, they should do whatever they want to do while they can, because when they get older and have responsibitlies they wont be able to do what they want, and then they may not ever find out what it is they were meant to do because they were to busy working to find out.