The imperial system uses measurements from an era where the length of your foot was the only measuring stick you had.
Moving on to standard units is the way to move forward, which is understood by both the scientific and military community in the US. It's just the average Joe on the street who keeps using imperial units.
Hell, shoe sizes are measured by the average length of BARLEY CORNS. Size 0 shoes = 11 barley corns in a row. Size 9 shoes = 11 + 9 barley corns.
Also, as far as inches go; "One of the earliest such definitions is that of 1324, where the legal definition of the inch was set out in a statute of Edward II of England, defining it as "three grains of barley, dry and round, placed end to end, lengthwise".
Knots comes from ancient mariners who used to gauge how fast their ship was moving by throwing a piece of wood or other floating object over the vessel’s bow then counting the amount of time that elapsed before its stern passed the object.
It's past time to move on to actual, scientific measurements instead of relying on the length of barley corns, average feet, ropes with floatsam on them and other ancient and imprecise measurements. Only reason some of these archaic measurements are accurate today is because they are being defined when compared to metric, e.g. one inch is now defined as precisely 2,54cm rather than "three grains of barley, dry and round, placed end to end, lengthwise".
Lets not even start with acres ("An acre was the amount of land tillable by one man behind one ox in one day.") and furlongs ("the distance a team of oxen could plough without resting.")
No... metric is the way forward. These other archaic, outmoded and ancient methods of measurement needs to be phased out, especially when they are only made more precises by measuring them up against the metric and define their actual lengths based on metrics (as seen with the case of inches).