The Japanese are very up front about their willingness to shoot down a missile if it nears Japanese territory. America and South Korea are prepared to shoot, as well.
It is unlikely that the missile will approach anybody's territory.
But if it does, somebody's going to light up the missile defenses.
And if North Korea makes good on their threat that firing at their missile means war against Japan, America, and South Korea, a war will destroy the North Korean regime. Pyongyang just doesn't have the horses to pull that threat off.