If he had been a better father, a better person, then maybe his kids would have been better off. Nobody could really say how things would have gone, but anything, any hint of his power would have been an improvement. Crystal would have been protected as she flung herself into danger. Eric would be able to take action instead of just sitting on the sidelines playing protector.
He was particularly worried about that. Defensive capes with nothing else to offer tended to be pushed to defend against stronger and stronger effects, until they reached their limit. If you're a blaster or striker and your power isn't strong enough your target walks it off. If you're a mover and your power isn't strong enough you arrive too late, or the bad guy escapes. If you're a brute or force field user and your power isn't strong enough, you die.
That was the real price of his mistake. Not the team, not his marriage, not the stability of the city. It was his children's future, traded away through nothing but weakness on his part.