Although I can understand where you are coming from, I still think it's a silly question.
1st comment - war is never good, and never 'worth it' People are hurt in wars, killed, maimed, emotionally destroyed. Multi-generational hatred is the product of war, evidence the hatred of Jews for white people, and vice-versa.
2. This race war in particular will be especially severe. Half the American population that doesn't emigrate by 2020 is projected to die due to the war and the effects of the total breakdown of American civilization. Disease and starvation will ultimately be the worst (indiscriminate) killers.
3. This war will be protracted, not short. After the initial fighting and battlelines being drawn, it will flare up and down for decades. I have heard projections of between 3 to 8 decades before America is peaceful enough to be rebuilt. Your children and grandchildren will likely be fighting this war, and your great-grandchildren may be as well.
4. Islam will likely gain a stronger foothold in Europe without American leadership. The Europeans will either integrate into history, or learn to ruthlessly, ruthlessly, ruthlessly protect their society. Merkel will either destroy Europe, or hang in the breeze.
1. On the positive side, Jewish multicultural, conflict-inducing influence upon American policies comes a halt. The most likely scenario indicates that Jews will hunted and be forced underground around the globe, not just in America. Eventually, the Jewish race completely ceases, in part because of their legacy in Western Nations.
2. Numerous secrets that have been kept from the public eye are revealed as a result of this civil war. And not just in America.
3. The powerful coteries, the secret hands that run our world will lose their evil influence, but only slowly, after many hard-won mini-revolutions.
Overall, having a race war accomplishes nothing, but it does set back American (and global) development by at least decades, if not longer, depending upon the severity of the civil war. The world is going to the same place regardless of whether we have this war or not. But with the war, we get there more slowly, more contentiously, but most of all, more honestly.