This will be resolved by a total collapse of our economy. $12T in debt is not the sum of our problems, we have last I heard, in excess of $150T in unfunded liabilities.
Politicians don't want to face the music, the people don't want to face the music. The people don't want to willfully make major changes in their lifestyle and no politician is going to commit political suicide by proposing it.
The economy will eventually collapse. The silver lining is that we'll take the rest of the world down with us, or we'll all go down together. How you term it is dependent on your viewpoint. There will be a global currency, and global leadership. Countries will cease to exist as sovereign nations, we'll all be under control of a central, world government. Each nation will have a leader in name only, but he or she will answer to a higher power. Who that power will be I don't know. There is a very real possibility of true global wars being fought to decide that. There's a very good chance that they will be fought along religious lines.
There is hope for it to shake down differently, but the chances of that being pulled off are very, very slim IMO.
Extrapolate our current situation out to it's logical conclusion. Take into account history and how long it took us to get where we are. It took our nation over 200 years to reach $6T in debt in 2002. It took us 7 years to double that. It doesn't take a genius to realize that this spending is not just unsustainable, but that it's accelerated at a pace that most would not have thought possible.
We're very close to collapse right now. By all means continue the partisan bickering. It's meaningless right along with health care reform, TARP, bailouts, cap and trade, all the issues of the moment. Survival will be the challenge of the next decade. You'll be surrendering freedoms at a pace that will make your head spin.
Edit: A glimmer of hope. Obama, after his sojourn to China, said for the first time that I can recall, that all this debt may be a bad thing. One can take an educated guess that the Chinese government gave him a stern talking to explaining that the well is running dry. If the funding is cut off, spending should start coming under control. But ...... the printing presses can still keep printing more money. Like I said, a glimmer.