From a US perspective, companies selling offshore will receive more US dollars, both because US goods become cheaper and because cheaper prices are stimulatory.
So the lower US$ is a positive for the US - eventually will reduce affordability of offshore products while increasing affordability of US products.
This is very complex however and any sudden falls in the US$ will force a flight from US equities. The warning bells are being sounded on this which is why action will be taken to prop up the US$ or deflate the Euro.
