Well, this is an interesting thread.......
But seriously, we don't know how anyone's life would turn out if they were on a different path. We don't know what causes people to lead exemplary lives, or to commit crimes, etc, and when that turning point was.
Just because she is in the position she is in now does not mean Cristina would not have made a great Queen. She certainly would not make a great queen NOW, but if she had not veered down the path she did, who can say? Felipe is thought to lead an exemplary life, but if he had been born into different circumstances, a different family, a country with equal primogeniture, who can say how he'd turn out?