I think an optimistic outlook would be Japan's lost decade. Unless we have a major economic reform that literally unleashes America's productivity (massive energy production, exploration, etc) OR an entirely new economic sector emerges (think the internet boom out of pretty much nothing), we could simply hope for a long, stagnation versus worst possibilities.
We still haven’t experienced the economic shock of Obamacare, the virtual nationalization of one sixth of U.S. economy, but as I’ve read, Big Pharma is now cutting down investments, as are medical equipment manufacturers and researchers. That is the elephant in the room, as I see it, something that Japan did not experience during the period you mention. We can only hope that Obamacare is defeated piece by piece, one way or another.
Our America is gone—but I have hopes that a new America will be born from the chaos that is coming—inflation, riots, central control, rationing, spies, and “the Camps” are all coming. But—things will change and change quickly. A spin to the right will come—that will be fascistic. There will be a great leader (it sure aint Obama) —there will be flags and uniforms, new music and art, yes, scapegoats too, It will be a re-brith but not of the America we once knew—a strange America with both good and bads. Good thing—No more PC, No more Race Cards, No more illegals, Globalism will be gone—we will make all we need here. More Jobs, a draft for National Service, yes, wars as well. Bads, Drug tests for all Americans once a month—failure to comply 6 months in the Labor Camps. A take over of all media—they will be forced to make pro-American films and TV shows or to the Camps with them! Freedom of speech will no longer exist. That’s what I see.