Why worried? I understand it signifies less of an exciting engineering presence in the united states, but beyond being disappointing, why is that actually a problem?
One reason is that whole ecosystems and expertise grow up around manufacturing, so it means the U.S. would lack both the knowledge and secondary industry. Also we'd be basically screwed in any standoff with China! Especially since their economy is heavily state-controlled, they would have a de-facto veto over any U.S. equipment that they didn't want built.
