Minor or not, the kid could still get get cited and fined for reckless driving and other low level offenses.
It is really just imprisonment where juvenile and adult punishments diverge, and especially long-term incarceration.
It is hard to say whether there will be civil charges.
If damages stay below say $250K, or whatever his insurance covers, then the insurance company may pick up the tab.
But, given apparent intent to cause harm, and multiple victims he and his family could be hit with a significant lawsuit.
The 15 year old kid that caused the Columbia Gorge fire was sentenced to 1,920 hours of community service and five years of probation, as well as being ordered to pay $36,631,687.10 in restitution.