UK just did. They have abandon pound and gallon.
The metric system is also used by NASA
Charles P. Goslee, Kodak Vice President, Chief Quality Officer, and one of the primary sponsors of the metrication program, stated, “Using the system of measure the rest of the world is using becomes a must for a global company to effectively operate and realize the many benefits of global parts sourcing, service, componentry, and to have the ability to technically exchange information on a common measurement basis around the world.”
Besides: isn’t the metric system a more scientific measure ?
Here is a relevant link:
U.S. Metric Association (USMA), Inc.
The U.S. Metric Association (USMA), Inc., with headquarters in Northridge CA, is a national non-profit organization, founded in 1916. It advocates U.S. conversion to the International System of Units which is known by the abbreviation SI (ess-eye). SI is also called the modern metric system. The process of changing our system of measurement units to the metric system (i.e. SI) is called metric transition or metrication.