Let me say right now that I'm not supporting the re-introduction of Imperial measurements in any kind of serious way - let's get that straight!
But, on a more 'just musing about it' level, there was something more human and organic about imperial measurements. They were based on time-honoured things like - fingers, forearms, feet etc, or the length of land oxen could plough in a day etc etc. Of course they're outmoded, and the metric system is the only one that's going to work in the scientific, technological age. But...how many of us can drink a litre of beer/lemonade? What we need is a pint, and saying 'half a litre' isn't quite the same. The same is true about a lot of metric quantities - they are great for doing science, but just not quite right for practical everyday life.
Just a comment - not an argument for bringing them back!