That is one possible outcome. Yet could some tangible crisis such as another war rally the American people to what they once were?
I remember my grandfather saying the only thing that saved America from the Great Depression was the Second World War.
The Greatest Generation rallied to win the war and propel America to stunning prosperity. That generation grew up on farms (75% of them, anyway) and had a solid work ethic. They also grew up in church.
But when they returned they moved to cities to be close to factory jobs. They wanted their children to have everything they did not have.
Their kids (boomers) were spoiled and lazy. Each successive generation is worse than before. 40% of the younger generation has said they will run rather than fight for their country. You're talking about two entirely different classes of Americans.
No, war will not rejuvenate a spirit of patriotism and faith in what's left of America.