It will be a tug of war between the right and the left, leaning slightly right on economic issues pretty much forever.
America is basically run by large corporations. I don't see them just willingly changing course. We will get small wins here and there, but nothing drastic for a long time.
AI and robotics are here, more people are seeing their futures stolen. If by "pretty much forever" you mean "about 5-10 years" then I agree. I said the system will break, I didn't say I see them changing course.
Capitalism naturally declines over time, that's why America and other developed countries have expanded internationally via Imperialism in order to super-exploit the third world for super-profits. Capitalism cannot last forever, eventually third world countries will shake off US influence and the empire will crumble.