Americans are ready to have only one system.
Dual units are more confusing.
And, as we have seen recently, use of non-SI units can cost millions of dollars in equipment failure or communication failure. The United States of America, birthplace of many established standards of hygiene and technology, must establish a true standard of measurement for its people. The status quo is a liability to our Nation in both trade and technology. To our own selves we should be true, and adopt SI throughout our society. Please use metric exclusively in your web sites.