The only advantage of the Imperial System is that we grew up with it.
Ask a three year old to break a stick of gum in halves, and he will be right to within 5%. Now try asking him to break off a tenth... He will not have a clue.
The human mind naturally breaks things down into halves, quarters, etc. Nobody has a good, instinctive feel for a tenth.
Now, if our numbering system was based on binary or eights, then the decimal systems would make a lot of sense. Unfortunately, we were cursed with ten fingers, so we have a ten-based numbering system that makes no sense at all. The metric system expands that nonsense into measurements.
So, if the rest of the World adopts Base-8 numbering, maybe we can take another look at the Metric System.