It doesn't mean it will replace humans, but it does mean it will kill a lot of current jobs, just like the Internet is killing many jobs now, but creating 3x more in return. Having a robot powered economy means consumerism will explode and there will be a lot of new jobs being created.
Obviously this will upset a lot of things and people in the short term as they need to change jobs, but I think most people are already starting to get used to switching jobs often. The country leaders will need to think long-term here, but seeing how US thinks about "saving jobs" right now, I wouldn't be surprised if they introduce some laws against robot manufacturing in the next few years, but hopefully they won't.
If they push this, it could create a new golden era of growth for USA. If they don't act fast, the Asians will do it first, and they'll continue to remain the leaders in manufacturing (which will probably end up happening).