The metric system, as said above, is helping to dumb down the population.
I have grown up with a mixture of imperial and metric measurements. I normaly use metric, as that is what school taught. But I weigh myself in stones, measure distances in miles etc.
However, the one thing the Imperial system did was ensure that people could multiply, divide, and cope with fractions. These are fundamental skills, which are sadly lacking by many youths today (like being able to read and write in non-text speak - on a side note did you know that you can score 97% on an English Language GCSE if you write everything in txt? They can only knock off 3% for spelling punctuation and grammar.)
If you have to deal with irregular multiples in the measurement system you are using, it will force you to learn it. If you can just add or remove zeros from a number, you dont need to know what you are doing, so you dont bother. The imperial system is good. Complicated but good.
On another breif tangent, the old Imperial nuts & bolts (thread sizes) were MUCH better than the metric ones, as you had both UNC and UNF, Coarse and Fine threads, suitable for different purposes, and more flexible. When one car manufacturer moved over to metric (cant remember which), they were replacing UNC bolts with the nearest metric equivalent. They forgot that the UNC bolts coarser thread was stronger, had problems, and ended up having to redo tooling and use bigger bolts. A costly mistake.